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			</style>[an error occurred while processing this directive]<div class="content-width"><ol class="breadcrumb text-uppercase"><li><a href="/">Home</a></li><li><a href="/aboutus/">About Us</a></li><li><a href="/people/">People</a></li><li><a href="/people/faculty.html">Faculty</a></li><li><a href="/people/IsmailIlkan.Ceylan"><span itemprop="name">Ismail Ilkan Ceylan</span></a></li><li class="active">Publications</li></ol></div><!-- MOBILE NAVIGATION --><div class="content-width space-below mobile-menu-placeholder visible-xs visible-sm"></div><!-- COLUMNS --><div class="container-fluid content-width"><div class="row"><div class="col-xs-12 col-md-9 col-md-push-3" id="maincontent"><!-- CONTENT (Column 2) --><div class="page-title"><h1>Ismail Ilkan Ceylan : Publications
</h1></div><div role="toolbar" class="btn-toolbar"><div class="btn-group"><a href="/people/publications/date/IsmailIlkan.Ceylan.html" aria-hidden="true" type="button" class="btn btn-oxford-blue"><span class="glyphicon glyphicon-sort-by-attributes"></span> By date</a><a href="/people/publications/title/IsmailIlkan.Ceylan.html" aria-hidden="true" type="button" class="btn btn-default"><span class="glyphicon glyphicon-sort-by-attributes"></span> By title</a><a href="/people/publications/type/IsmailIlkan.Ceylan.html" aria-hidden="true" type="button" class="btn btn-default"><span class="glyphicon glyphicon-sort-by-attributes"></span> By type</a><a href="/people/publications/bibtex/IsmailIlkan.Ceylan.html" aria-hidden="true" type="button" class="btn btn-default"><span class="glyphicon glyphicon-file"></span> BibTex</a></div></div><p></p><ul class="list-unbulleted list-unbulleted-spaced"><li>
	
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				[1] 
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	<p class="publicationTitle"> <strong>
            Homomorphism Counts as Structural Encodings for Graph Learning </strong> </p>
	    <p class="publicationAuthors"> <em> Linus Bao&#x201a; Emily Jin&#x201a; Michael Bronstein&#x201a; Ismail Ilkan Ceylan and Matthias Lanzinger  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the Thirteeneth International Conference on Learning Representations (ICLR)</em>.
        2025.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication16492-abstract.html">
			Details <span class="sr-only" > about <em> Homomorphism Counts as Structural Encodings for Graph Learning  </em></span> </a> |
			<a href="/publications/publication16492.bib">
			BibTeX  <span class="sr-only" > data for <em> Homomorphism Counts as Structural Encodings for Graph Learning  </em></span>   </a>
			
			
		
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				[2] 
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	<p class="publicationTitle"> <strong>
            Explanations for Query Answers under Existential Rules </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan&#x201a; Thomas Lukasiewicz&#x201a; Enrico Malizia and Andrius Vaicenavi&#x010d;ius  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Artificial Intelligence</em>.
        2024.
        </p> <p
            class="publicationNote"> Conditionally accepted for publication</p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication16248-abstract.html">
			Details <span class="sr-only" > about <em> Explanations for Query Answers under Existential Rules  </em></span> </a> |
			<a href="/publications/publication16248.bib">
			BibTeX  <span class="sr-only" > data for <em> Explanations for Query Answers under Existential Rules  </em></span>   </a>
			
			
		
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				[3] 
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	<p class="publicationTitle"> <strong>
            Fisher Flow Matching for Generative Modeling over Discrete Data </strong> </p>
	    <p class="publicationAuthors"> <em> Oscar Davis&#x201a; Samuel Kessler&#x201a; Mircea Petrache&#x201a; &#x0130;smail &#x0130;lkan Ceylan&#x201a; Michael Bronstein and Avishek Joey Bose  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the 38th Annual Conference on Neural Information Processing Systems (NeurIPS)</em>.
        2024.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication16432-abstract.html">
			Details <span class="sr-only" > about <em> Fisher Flow Matching for Generative Modeling over Discrete Data  </em></span> </a> |
			<a href="/publications/publication16432.bib">
			BibTeX  <span class="sr-only" > data for <em> Fisher Flow Matching for Generative Modeling over Discrete Data  </em></span>   </a>
			
			
					| <a href="https://arxiv.org/abs/2405.14664"> Link <span class="sr-only" > to <em> Fisher Flow Matching for Generative Modeling over Discrete Data  </em></span> </a>
  				
		
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				[4] 
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	<p class="publicationTitle"> <strong>
            Learning on Large Graphs using Intersecting Communities </strong> </p>
	    <p class="publicationAuthors"> <em> Ben Finkelshtein&#x201a; &#x0130;smail &#x0130;lkan Ceylan&#x201a; Michael Bronstein and Ron Levie  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the 38th Annual Conference on Neural Information Processing Systems (NeurIPS)</em>.
        2024.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication16431-abstract.html">
			Details <span class="sr-only" > about <em> Learning on Large Graphs using Intersecting Communities  </em></span> </a> |
			<a href="/publications/publication16431.bib">
			BibTeX  <span class="sr-only" > data for <em> Learning on Large Graphs using Intersecting Communities  </em></span>   </a>
			
			
					| <a href="https://arxiv.org/abs/2405.20724"> Link <span class="sr-only" > to <em> Learning on Large Graphs using Intersecting Communities  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Almost Surely Asymptotically Constant Graph Neural Networks </strong> </p>
	    <p class="publicationAuthors"> <em> Sam Adam&#x2212;Day&#x201a; Michael Benedikt&#x201a; &#x0130;smail &#x0130;lkan Ceylan and Ben Finkelshtein  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the 38th Annual Conference on Neural Information Processing Systems (NeurIPS)</em>.
        2024.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication16430-abstract.html">
			Details <span class="sr-only" > about <em> Almost Surely Asymptotically Constant Graph Neural Networks  </em></span> </a> |
			<a href="/publications/publication16430.bib">
			BibTeX  <span class="sr-only" > data for <em> Almost Surely Asymptotically Constant Graph Neural Networks  </em></span>   </a>
			
			
					| <a href="https://arxiv.org/abs/2403.03880"> Link <span class="sr-only" > to <em> Almost Surely Asymptotically Constant Graph Neural Networks  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Position Paper: Future Directions in Foundations of Graph Machine Learning </strong> </p>
	    <p class="publicationAuthors"> <em> Christopher Morris&#x201a; Nadav Dym&#x201a; Haggai Maron&#x201a; &#x0130;smail &#x0130;lkan Ceylan&#x201a; Fabrizio Frasca&#x201a; Ron Levie&#x201a; Derek Lim&#x201a; Michael Bronstein&#x201a; Martin Grohe and Stefanie Jegelka  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            In Proceedings of Fourty&#x2212;first International Conference on Machine Learning (ICML)</em>.
        2024.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication16281-abstract.html">
			Details <span class="sr-only" > about <em> Position Paper: Future Directions in Foundations of Graph Machine Learning  </em></span> </a> |
			<a href="/publications/publication16281.bib">
			BibTeX  <span class="sr-only" > data for <em> Position Paper: Future Directions in Foundations of Graph Machine Learning  </em></span>   </a>
			
			
					| <a href="https://arxiv.org/pdf/2402.02287"> Link <span class="sr-only" > to <em> Position Paper: Future Directions in Foundations of Graph Machine Learning  </em></span> </a>
  				
		
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				[7] 
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	<p class="publicationTitle"> <strong>
            Homomorphism Counts for Graph Neural Networks: All About That Basis </strong> </p>
	    <p class="publicationAuthors"> <em> Emily Jin&#x201a; Michael Bronstein&#x201a; &#x0130;smail &#x0130;lkan Ceylan and Matthias Lanzinger  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of Fourty&#x2212;first International Conference on Machine Learning (ICML)</em>.
        2024.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication16280-abstract.html">
			Details <span class="sr-only" > about <em> Homomorphism Counts for Graph Neural Networks: All About That Basis  </em></span> </a> |
			<a href="/publications/publication16280.bib">
			BibTeX  <span class="sr-only" > data for <em> Homomorphism Counts for Graph Neural Networks: All About That Basis  </em></span>   </a>
			
			
					| <a href="https://arxiv.org/abs/2402.08595"> Link <span class="sr-only" > to <em> Homomorphism Counts for Graph Neural Networks: All About That Basis  </em></span> </a>
  				
		
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				[8] 
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	<p class="publicationTitle"> <strong>
            Cooperative Graph Neural Networks </strong> </p>
	    <p class="publicationAuthors"> <em> Ben Finkelshtein&#x201a; Xingyue Huang&#x201a; Michael Bronstein and &#x0130;smail &#x0130;lkan Ceylan  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of Fourty&#x2212;first International Conference on Machine Learning (ICML)</em>.
        2024.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication16279-abstract.html">
			Details <span class="sr-only" > about <em> Cooperative Graph Neural Networks  </em></span> </a> |
			<a href="/publications/publication16279.bib">
			BibTeX  <span class="sr-only" > data for <em> Cooperative Graph Neural Networks  </em></span>   </a>
			
			
					| <a href="https://arxiv.org/abs/2310.01267"> Link <span class="sr-only" > to <em> Cooperative Graph Neural Networks  </em></span> </a>
  				
		
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				[9] 
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	<p class="publicationTitle"> <strong>
            A Theory of Link Prediction via Relational Weisfeiler&#x2212;Leman on Knowledge Graphs </strong> </p>
	    <p class="publicationAuthors"> <em> Xingyue Huang&#x201a; Miguel Romero Orth&#x201a; &#x0130;smail &#x0130;lkan Ceylan and Pablo Barcelo  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the 37th Annual Conference on Neural Information Processing Systems (NeurIPS)</em>.
        2023.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication15913-abstract.html">
			Details <span class="sr-only" > about <em> A Theory of Link Prediction via Relational Weisfeiler&#x2212;Leman on Knowledge Graphs  </em></span> </a> |
			<a href="/publications/publication15913.bib">
			BibTeX  <span class="sr-only" > data for <em> A Theory of Link Prediction via Relational Weisfeiler&#x2212;Leman on Knowledge Graphs  </em></span>   </a>
			
			
					| <a href="https://arxiv.org/abs/2302.02209"> Link <span class="sr-only" > to <em> A Theory of Link Prediction via Relational Weisfeiler&#x2212;Leman on Knowledge Graphs  </em></span> </a>
  				
		
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				[10] 
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	<p class="publicationTitle"> <strong>
            PlanE: Representation Learning over Planar Graphs </strong> </p>
	    <p class="publicationAuthors"> <em> Radoslav Dimitrov&#x201a; Zeyang Zhao&#x201a; Ralph Abboud and &#x0130;smail &#x0130;lkan Ceylan  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the 37th Annual Conference on Neural Information Processing Systems (NeurIPS)</em>.
        2023.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication15912-abstract.html">
			Details <span class="sr-only" > about <em> PlanE: Representation Learning over Planar Graphs  </em></span> </a> |
			<a href="/publications/publication15912.bib">
			BibTeX  <span class="sr-only" > data for <em> PlanE: Representation Learning over Planar Graphs  </em></span>   </a>
			
			
					| <a href="https://arxiv.org/abs/2307.01180"> Link <span class="sr-only" > to <em> PlanE: Representation Learning over Planar Graphs  </em></span> </a>
  				
		
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				[11] 
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	<p class="publicationTitle"> <strong>
            Zero&#x2212;One Laws of Graph Neural Networks </strong> </p>
	    <p class="publicationAuthors"> <em> Sam Adam&#x2212;Day&#x201a; Theodor Mihai Iliant and &#x0130;smail &#x0130;lkan Ceylan  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the 37th Annual Conference on Neural Information Processing Systems (NeurIPS)</em>.
        2023.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication15911-abstract.html">
			Details <span class="sr-only" > about <em> Zero&#x2212;One Laws of Graph Neural Networks  </em></span> </a> |
			<a href="/publications/publication15911.bib">
			BibTeX  <span class="sr-only" > data for <em> Zero&#x2212;One Laws of Graph Neural Networks  </em></span>   </a>
			
			
					| <a href="https://arxiv.org/abs/2301.13060"> Link <span class="sr-only" > to <em> Zero&#x2212;One Laws of Graph Neural Networks  </em></span> </a>
  				
		
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				[12] 
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	<p class="publicationTitle"> <strong>
            The Dichotomy of Evaluating Homomorphism&#x2212;Closed Queries on Probabilistic Graphs </strong> </p>
	    <p class="publicationAuthors"> <em> Antoine Amarilli and &#x0130;smail &#x0130;lkan Ceylan  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Logical Methods in Computer Science</em>.
        
            Vol. 18/1.
        2022.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication14891-abstract.html">
			Details <span class="sr-only" > about <em> The Dichotomy of Evaluating Homomorphism&#x2212;Closed Queries on Probabilistic Graphs  </em></span> </a> |
			<a href="/publications/publication14891.bib">
			BibTeX  <span class="sr-only" > data for <em> The Dichotomy of Evaluating Homomorphism&#x2212;Closed Queries on Probabilistic Graphs  </em></span>   </a>
			
			
					| <a href="https://doi.org/10.46298/lmcs-18(1:2)2022"> Link <span class="sr-only" > to <em> The Dichotomy of Evaluating Homomorphism&#x2212;Closed Queries on Probabilistic Graphs  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Shortest Path Networks for Graph Property Prediction </strong> </p>
	    <p class="publicationAuthors"> <em> Ralph Abboud&#x201a; Radoslav Dimitrov and &#x0130;smail &#x0130;lkan Ceylan  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the First Learning on Graphs Conference (LoG)</em>.
        2022.
        </p> <p
            class="publicationNote"> Oral presentation</p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication15644-abstract.html">
			Details <span class="sr-only" > about <em> Shortest Path Networks for Graph Property Prediction  </em></span> </a> |
			<a href="/publications/publication15644.bib">
			BibTeX  <span class="sr-only" > data for <em> Shortest Path Networks for Graph Property Prediction  </em></span>   </a>
			
			
					| <a href="https://arxiv.org/abs/2206.01003"> Link <span class="sr-only" > to <em> Shortest Path Networks for Graph Property Prediction  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Query Answer Explanations under Existential Rules </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan&#x201a; Thomas Lukasiewicz&#x201a; Enrico Malizia and Andrius Vaicenavicius  </em> </p>
	
	<p class="publicationDetails"> 
            In Giuseppe Amato&#x201a; Valentina Bartalesi&#x201a; Devis Bianchini&#x201a; Claudio Gennaro and Riccardo Torlone, editors,
             
            <em>
            Proceedings of the 30th Italian Symposium on Advanced Database Systems&#x201a; SEBD 2022&#x201a; Tirrenia (PI)&#x201a; Italy&#x201a; June 19&#x2212;22&#x201a; 2022</em>.
        
            Vol. 3194
                of CEUR Workshop Proceedings.
        
                Pages 481&#x2013;488.
            CEUR&#x2212;WS.org.
        2022.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication15642-abstract.html">
			Details <span class="sr-only" > about <em> Query Answer Explanations under Existential Rules  </em></span> </a> |
			<a href="/publications/publication15642.bib">
			BibTeX  <span class="sr-only" > data for <em> Query Answer Explanations under Existential Rules  </em></span>   </a>
			
			
					| <a href="http://ceur-ws.org/Vol-3194/paper56.pdf"> Download (pdf)  <span class="sr-only" > of <em> Query Answer Explanations under Existential Rules  </em></span>   </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Temporal Knowledge Graph Completion using Box Embeddings </strong> </p>
	    <p class="publicationAuthors"> <em> Johannes Messner&#x201a; Ralph Abboud and &#x0130;smail &#x0130;lkan Ceylan  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the 36th AAAI Conference on Artificial Intelligence&#x201a; AAAI 2022&#x201a; Vancouver&#x201a; BC&#x201a; Canada. AAAI Press</em>.
        2022.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication14893-abstract.html">
			Details <span class="sr-only" > about <em> Temporal Knowledge Graph Completion using Box Embeddings  </em></span> </a> |
			<a href="/publications/publication14893.bib">
			BibTeX  <span class="sr-only" > data for <em> Temporal Knowledge Graph Completion using Box Embeddings  </em></span>   </a>
			
			
					| <a href="https://arxiv.org/abs/2109.08970"> Link <span class="sr-only" > to <em> Temporal Knowledge Graph Completion using Box Embeddings  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Equivariant Quantum Graph Circuits </strong> </p>
	    <p class="publicationAuthors"> <em> Peter M&#xe9;rnyei&#x201a; Konstantinos Meichanetzidis and &#x0130;smail &#x0130;lkan Ceylan  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the 39th International Conference on Machine Learning&#x201a; ICML 2022&#x201a; Baltimore&#x201a; Maryland&#x201a; USA</em>.
        2022.
        </p>
	
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            		href="/publications/publication14892-abstract.html">
			Details <span class="sr-only" > about <em> Equivariant Quantum Graph Circuits  </em></span> </a> |
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		>
			
	
	<p class="publicationTitle"> <strong>
            The Surprising Power of Graph Neural Networks with Random Node Initialization </strong> </p>
	    <p class="publicationAuthors"> <em> Ralph Abboud&#x201a; &#x0130;smail &#x0130;lkan Ceylan&#x201a; Martin Grohe and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the 30th International Joint Conference on Artificial Intelligence&#x201a; IJCAI 2021&#x201a; August 21&#x2013;26&#x201a; 2021</em>.
        IJCAI.
        August,
            2021.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Open&#x2212;World Probabilistic Databases: Semantics&#x201a; Algorithms&#x201a; Complexity </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan&#x201a; Adnan Darwiche and Guy Van den Broeck  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Artificial Intelligence</em>.
        
            Vol. 295.
        2021.
        </p>
	
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            		href="/publications/publication14483-abstract.html">
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			 | <a
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		DOI (https://doi.org/10.1016/j.artint.2021.103474)
		</a> 
					| <a href="https://www.sciencedirect.com/science/article/pii/S0004370221000254?via%3Dihub"> Link <span class="sr-only" > to <em> Open&#x2212;World Probabilistic Databases: Semantics&#x201a; Algorithms&#x201a; Complexity  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Preferred Explanations for Ontology&#x2212;Mediated Queries under Existential Rules </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan&#x201a; Thomas Lukasiewicz&#x201a; Enrico Malizia&#x201a; Cristian Molinaro and Andrius Vaicenavi&#x010d;ius  </em> </p>
	
	<p class="publicationDetails"> 
            In Kevin Leyton&#x2212;Brown and Mausam, editors,
             
            <em>
            Proceedings of the 35th AAAI Conference on Artificial Intelligence&#x201a; AAAI 2021&#x201a; Virtual Conference&#x201a; February 2&#x2013;9&#x201a; 2021</em>.
        AAAI Press.
        2021.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Explanations for Negative Query Answers under Existential Rules </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan&#x201a; Thomas Lukasiewicz&#x201a; Enrico Malizia&#x201a; Cristian Molinaro and Andrius Vaicenavi&#x010d;ius  </em> </p>
	
	<p class="publicationDetails"> 
            In Diego Calvanese and Esra Erdem, editors,
             
            <em>
            Proceedings of 17th International Conference on Principles of Knowledge Representation and Reasoning&#x201a; KR 2020&#x201a; Rhodes&#x201a; Greece&#x201a; September 12&#x2212;18&#x201a; 2020</em>.
        AAAI Press.
        September,
            2020.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Explanations for Ontology&#x2212;Mediated Query Answering in Description Logics </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan&#x201a; Thomas Lukasiewicz&#x201a; Enrico Malizia and Andrius Vaicenavi&#x010d;ius  </em> </p>
	
	<p class="publicationDetails"> 
            In Giuseppe De Giacomo, editor,
             
            <em>
            Proceedings of the 24th European Conference on Artificial Intelligence&#x201a; ECAI 2020&#x201a; Santiago de Compostela&#x201a; Spain&#x201a; June 8&#x2013;12&#x201a; 2020</em>.
        IOS Press.
        June,
            2020.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Neural Networks for Approximate DNF Counting: An Abridged Report </strong> </p>
	    <p class="publicationAuthors"> <em> Ralph Abboud&#x201a; &#x0130;smail &#x0130;lkan Ceylan and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Lingfei Wu&#x201a; Jian Tang&#x201a; Yinglong Xia and Charu Aggarwal, editors,
             
            <em>
            Proceedings of the 1st International Workshop on Deep Learning on Graphs: Methodologies and Applications&#x201a; DLGMA 2020&#x201a; New York&#x201a; New York&#x201a; USA&#x201a; February 8&#x201a; 2020</em>.
        February,
            2020.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Learning to Reason: Leveraging Neural Networks for Approximate DNF Counting </strong> </p>
	    <p class="publicationAuthors"> <em> Ralph Abboud&#x201a; &#x0130;smail &#x0130;lkan Ceylan and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Vincent Conitzer and Fei Sha, editors,
             
            <em>
            Proceedings of the 34th AAAI Conference on Artificial Intelligence&#x201a; AAAI 2020&#x201a; New York&#x201a; New York&#x201a; USA&#x201a; February 7&#x2013;12&#x201a; 2020</em>.
        AAAI Press.
        February,
            2020.
        </p>
	
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	<p class="publicationTitle"> <strong>
            BoxE: A Box Embedding Model for Knowledge Base Completion </strong> </p>
	    <p class="publicationAuthors"> <em> Ralph Abboud&#x201a; &#x0130;smail &#x0130;lkan Ceylan&#x201a; Thomas Lukasiewicz and Tommaso Salvatori  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Proceedings of the 34th Annual Conference on Neural Information Processing Systems&#x201a; NeurIPS 2020&#x201a; December 6&#x2013;12&#x201a; 2020</em>.
        December,
            2020.
        </p>
	
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					| <a href="https://proceedings.neurips.cc/paper/2020/hash/6dbbe6abe5f14af882ff977fc3f35501-Abstract.html"> Link <span class="sr-only" > to <em> BoxE: A Box Embedding Model for Knowledge Base Completion  </em></span> </a>
  				
		
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		>
			
	
	<p class="publicationTitle"> <strong>
            Explanations for Ontology&#x2212;Mediated Query Answering in Description Logics (Extended Abstract) </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan&#x201a; Thomas Lukasiewicz&#x201a; Enrico Malizia and Andrius Vaicenavicius  </em> </p>
	
	<p class="publicationDetails"> 
            In Stefan Borgwardt and Thomas Meyer, editors,
             
            <em>
            Proceedings of the 33rd International Workshop on Description Logics&#x201a; DL 2020&#x201a; co&#x2212;located with the 17th International Conference on Principles of Knowledge Representation and Reasoning&#x201a; KR 2020&#x201a; Online Event [Rhodes&#x201a; Greece]&#x201a; September 12&#x2013;14&#x201a; 2020</em>.
        
            Vol. 2663
                of CEUR Workshop Proceedings.
        CEUR&#x2212;WS.org.
        2020.
        </p>
	
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            		href="/publications/publication14260-abstract.html">
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	<p class="publicationTitle"> <strong>
            On the Approximability of Weighted Model Integration on DNF Structures </strong> </p>
	    <p class="publicationAuthors"> <em> Ralph Abboud&#x201a; &#x0130;smail &#x0130;lkan Ceylan and Radoslav Dimitrov  </em> </p>
	
	<p class="publicationDetails"> 
            In Diego Calvanese and Esra Erdem, editors,
             
            <em>
            Proceedings of 17th International Conference on Principles of Knowledge Representation and Reasoning&#x201a; KR 2020&#x201a; September 12&#x2212;18&#x201a; Rhodes&#x201a; Greece</em>.
        AAAI Press.
        2020.
        </p>
	
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					| <a href="https://arxiv.org/pdf/2002.06726.pdf"> Download (pdf)  <span class="sr-only" > of <em> On the Approximability of Weighted Model Integration on DNF Structures  </em></span>   </a>
  				
		
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		>
			
	
	<p class="publicationTitle"> <strong>
            A Dichotomy for Homomorphism&#x2212;Closed Queries on Probabilistic Graphs </strong> </p>
	    <p class="publicationAuthors"> <em> Antoine Amarilli and &#x0130;smail &#x0130;lkan Ceylan  </em> </p>
	
	<p class="publicationDetails"> 
            In Carsten Lutz, editor,
             
            <em>
            Proceedings of the 23rd International Conference on Database Theory&#x201a; ICDT 2020&#x201a; Copenhagen&#x201a; Denmark&#x201a; 30th March&#x2212;2nd April&#x201a; 2020</em>.
        Schloss Dagstuhl&#x2013;Leibniz&#x2212;Zentrum fuer Informatik.
        2020.
        </p> <p
            class="publicationNote"> Best Paper Prize</p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication13787-abstract.html">
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	<p class="publicationTitle"> <strong>
            Explanations for Query Answers under Existential Rules </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan&#x201a; Thomas Lukasiewicz&#x201a; Enrico Malizia and Andrius Vaicenavi&#x010d;ius  </em> </p>
	
	<p class="publicationDetails"> 
            In Sarit Kraus, editor,
             
            <em>
            Proceedings of the 28th International Joint Conference on Artificial Intelligence&#x201a; IJCAI 2019&#x201a; Macao&#x201a; China&#x201a; August 10&#x2212;16&#x201a; 2019</em>.
        
                Pages 1639&#x2013;1646.
            IJCAI/AAAI Press.
        August,
            2019.
        </p>
	
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					| <a href="https://doi.org/10.24963/ijcai.2019/227"> Link <span class="sr-only" > to <em> Explanations for Query Answers under Existential Rules  </em></span> </a>
  				
		
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	<p class="publicationTitle"> <strong>
            Ontology&#x2212;Mediated Query Answering over Log&#x2212;Linear Probabilistic Data (Abstract) </strong> </p>
	    <p class="publicationAuthors"> <em> Stefan Borgwardt&#x201a; &#x0130;smail &#x0130;lkan Ceylan and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Mantas Simkus and Grant E. Weddell, editors,
             
            <em>
            Proceedings of the 32nd International Workshop on Description Logics&#x201a; DL 2019&#x201a; Oslo&#x201a; Norway&#x201a; June 18&#x2212;21&#x201a; 2019</em>.
        
            Vol. 2373
                of CEUR Workshop Proceedings.
        CEUR&#x2212;WS.org.
        June,
            2019.
        </p>
	
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            		href="/publications/publication12679-abstract.html">
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	<p class="publicationTitle"> <strong>
            Ontology&#x2212;Mediated Query Answering over Log&#x2212;Linear Probabilistic Data </strong> </p>
	    <p class="publicationAuthors"> <em> Stefan Borgwardt&#x201a; &#x0130;smail &#x0130;lkan Ceylan and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Pascal Van Hentenryck and Zhi&#x2212;Hua Zhou, editors,
             
            <em>
            Proceedings of the 33rd National Conference on Artificial Intelligence&#x201a; AAAI 2019&#x201a; Honolulu&#x201a; Hawaii&#x201a; USA&#x201a; January 27 &#x2212; February 1&#x201a; 2019</em>.
        
                Pages 2711&#x2013;2718.
            AAAI Press.
        January,
            2019.
        </p>
	
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            		href="/publications/publication12218-abstract.html">
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	<p class="publicationTitle"> <strong>
            A Tutorial on Query Answering and Reasoning over Probabilistic Knowledge Bases </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Claudia d'Amato and Martin Theobald, editors,
             
            <em>
            Reasoning Web. Learning&#x201a; Uncertainty&#x201a; Streaming&#x201a; and Scalability &#x2014; 14th International Summer School 2018&#x201a; Esch&#x2212;sur&#x2212;Alzette&#x201a; Luxembourg&#x201a; September 22&#x2212;26&#x201a; 2018&#x201a; Tutorial Lectures</em>.
        
            Vol. 11078
                of Lecture Notes in Computer Science.
        
                Pages 35&#x2013;77.
            Springer.
        August,
            2018.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Recent Advances in Querying Probabilistic Knowledge Bases </strong> </p>
	    <p class="publicationAuthors"> <em> Stefan Borgwardt&#x201a; &#x0130;smail &#x0130;lkan Ceylan and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In J&#xe9;r&#xf4;me Lang, editor,
             
            <em>
            Proceedings of the 27th International Joint Conference on Artificial Intelligence and the 23rd European Conference on Artificial Intelligence&#x201a; IJCAI&#x2212;ECAI 2018&#x201a; Stockholm&#x201a; Sweden&#x201a; July 13&#x2212;19&#x201a; 2018</em>.
        
                Pages 5420&#x2212;5426.
            IJCAI/AAAI Press.
        July,
            2018.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Anfragebeantwortung in Probabilistischen Datenbanken und Wissensbasen. </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan  </em> </p>
	
	<p class="publicationDetails"> 
            In Steffen H&#xf6;lldobler, editor,
             
            <em>
            Proceedings of Ausgezeichnete Informatikdissertationen&#x201a; Dagstuhl&#x201a; Germany&#x201a; May 6&#x2212;9&#x201a; 2018</em>.
        Springer Verlag.
        2018.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Open&#x2212;World Probabilistic Databases: An Abridged Report </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan&#x201a; Adnan Darwiche and Guy Van Den Broeck  </em> </p>
	
	<p class="publicationDetails"> 
            In Carles Sierra, editor,
             
            <em>
            Proceedings of the 26th International Joint Conference on Artificial Intelligence&#x201a; IJCAI 2017&#x201a; Melbourne&#x201a; Australia&#x201a; August 19&#x2212;25&#x201a; 2017</em>.
        
                Pages 4796&#x2212;4800.
            IJCAI/AAAI Press.
        August,
            2017.
        </p> <p
            class="publicationNote"> Sister Conference Best Paper Track</p>
	
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	<p class="publicationTitle"> <strong>
            Most Probable Explanations for Probabilistic Database Queries </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan&#x201a; Stefan Borgwardt and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Carles Sierra, editor,
             
            <em>
            Proceedings of the 26th International Joint Conference on Artificial Intelligence&#x201a; IJCAI 2017&#x201a; Melbourne&#x201a; Australia&#x201a; August 19&#x2212;25&#x201a; 2017</em>.
        
                Pages 950&#x2013;956.
            IJCAI/AAAI Press.
        August,
            2017.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Query Answering in Ontologies Under Preference Rankings </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan&#x201a; Thomas Lukasiewicz&#x201a; Rafael Pe&#xf1;aloza and Oana Tifrea&#x2212;Marciuska  </em> </p>
	
	<p class="publicationDetails"> 
            In Carles Sierra, editor,
             
            <em>
            Proceedings of the 26th International Joint Conference on Artificial Intelligence&#x201a; IJCAI 2017&#x201a; Melbourne&#x201a; Australia&#x201a; August 19&#x2212;25&#x201a; 2017</em>.
        
                Pages 943&#x2013;949.
            IJCAI/AAAI Press.
        August,
            2017.
        </p>
	
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	<p class="publicationTitle"> <strong>
            The Bayesian Ontology Language BEL </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan and Rafael Pe&#xf1;aloza  </em> </p>
	
	<p class="publicationDetails"> 
        In <em>Journal of Automated Reasoning</em>.
        
            Vol. 58.
        
            No. 1.
        
                Pages 67&#x2013;95.
            2017.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Ontology&#x2212;Mediated Queries for Probabilistic Databases </strong> </p>
	    <p class="publicationAuthors"> <em> Stefan Borgwardt&#x201a; &#x0130;smail &#x0130;lkan Ceylan and Thomas Lukasiewicz  </em> </p>
	
	<p class="publicationDetails"> 
            In Satinder Singh and Shaul Markovitch, editors,
             
            <em>
            Proceedings of the 31st National Conference on Artificial Intelligence&#x201a; AAAI 2017&#x201a; San Francisco&#x201a; California&#x201a; USA&#x201a; February 4&#x2013;9&#x201a; 2017</em>.
        
                Pages 1063&#x2013;1069.
            AAAI Press.
        2017.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Query Answering in Probabilistic Data and Knowledge Bases </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan  </em> </p>
	
	<p class="publicationDetails">  PhD Thesis TU Dresden.
        2017.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Complexity Results for Probabilistic Datalog+&#x2044;&#x2212; </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan&#x201a; Thomas Lukasiewicz and Rafael Pe&#xf1;aloza  </em> </p>
	
	<p class="publicationDetails"> 
            In Maria S. Fox and Gal A. Kaminka, editors,
             
            <em>
            Proceedings of the 22nd European Conference on Artificial Intelligence&#x201a; ECAI 2016&#x201a; The Hague&#x201a; The Netherlands&#x201a; August 29 &#x2212; September 2&#x201a; 2016</em>.
        
                Pages 1414&#x2212;1422.
            IOS Press.
        August,
            2016.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Open&#x2212;World Probabilistic Databases </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan&#x201a; Adnan Darwiche and Guy Van den Broeck  </em> </p>
	
	<p class="publicationDetails"> 
            In Chitta Baral&#x201a; James P. Delgrande and Frank Wolter, editors,
             
            <em>
            Proceedings of the 15th International Conference on Principles of Knowledge Representation and Reasoning&#x201a; KR 2016&#x201a; Cape Town&#x201a; South Africa&#x201a; April 25&#x2212;29&#x201a; 2016.</em>.
        
                Pages 339&#x2013;348.
            AAAI Press.
        2016.
        </p> <p
            class="publicationNote"> Marco Cadoli&#x2212;Best Student Paper Award</p>
	
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	<p class="publicationTitle"> <strong>
            Open&#x2212;World Probabilistic Databases (Extended Abstract) </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan&#x201a; Adnan Darwiche and Guy Van den Broeck  </em> </p>
	
	<p class="publicationDetails"> 
            In Maurizio Lenzerini and Rafael Pe&#xf1;aloza, editors,
             
            <em>
            Proceedings of the 29th International Workshop on Description Logics&#x201a; Cape Town&#x201a; South Africa&#x201a; April 22&#x2212;25&#x201a; 2016</em>.
        
            Vol. 1577
                of CEUR Workshop Proceedings.
        CEUR&#x2212;WS.org.
        2016.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Probabilistic Query Answering in the Bayesian Description Logic BEL </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan and Rafael Pe&#xf1;aloza  </em> </p>
	
	<p class="publicationDetails"> 
            In Christoph Beierle and Alex Dekhtyar, editors,
             
            <em>
            Proceedings of the 9th International Conference on Scalable Uncertainty Management&#x201a; SUM 2015&#x201a; Qu&#xe9;bec City&#x201a; QC&#x201a; Canada&#x201a; September 16&#x2212;18&#x201a; 2015.</em>.
        
            Vol. 9310
                of Lecture Notes in Computer Science.
        
                Pages 21&#x2013;35.
            Springer.
        2015.
        </p>
	
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	<p class="publicationTitle"> <strong>
            The Bayesian Ontology Reasoner is BORN! </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan&#x201a; Julian Mendez and Rafael Pe&#xf1;aloza  </em> </p>
	
	<p class="publicationDetails"> 
            In Michel Dumontier&#x201a; Birte Glimm&#x201a; Rafael S. Gon&#xe7;alves&#x201a; Matthew Horridge&#x201a; Ernesto Jim&#xe9;nez&#x2212;Ruiz&#x201a; Nicolas Matentzoglu&#x201a; Bijan Parsia&#x201a; Giorgos B. Stamou and Giorgos Stoilos, editors,
             
            <em>
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            Vol. 1387
                of CEUR Workshop Proceedings.
        
                Pages 8&#x2013;14.
            CEUR&#x2212;WS.org.
        2015.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Dynamic Bayesian Description Logics </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan and Rafael Pe&#xf1;aloza  </em> </p>
	
	<p class="publicationDetails"> 
            In Diego Calvanese and Boris Konev, editors,
             
            <em>
            Proceedings of the 28th International Workshop on Description Logics&#x201a; Athens&#x201a;Greece&#x201a; June 7&#x2212;10&#x201a; 2015</em>.
        
            Vol. 1350
                of CEUR Workshop Proceedings.
        CEUR&#x2212;WS.org.
        2015.
        </p>
	
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	<p class="publicationTitle"> <strong>
            Query Answering in Bayesian Description Logics </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan  </em> </p>
	
	<p class="publicationDetails"> 
            In Diego Calvanese and Boris Konev, editors,
             
            <em>
            Proceedings of the 28th International Workshop on Description Logics&#x201a; Athens&#x201a; Greece&#x201a; June 7&#x2212;10&#x201a; 2015.</em>.
        
            Vol. 1350
                of CEUR Workshop Proceedings.
        CEUR&#x2212;WS.org.
        2015.
        </p>
	
        		<p class="publicationlinks"> <a
        
            		href="/publications/publication11619-abstract.html">
			Details <span class="sr-only" > about <em> Query Answering in Bayesian Description Logics  </em></span> </a> |
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		>
			
	
	<p class="publicationTitle"> <strong>
            Answering EL Queries in the Presence of Preferences </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan&#x201a; Thomas Lukasiewicz and Rafael Pe&#xf1;aloza  </em> </p>
	
	<p class="publicationDetails"> 
            In Diego Calvanese and Boris Konev, editors,
             
            <em>
            Proceedings of the 28th International Workshop on Description Logics&#x201a; DL 2015&#x201a; Athens&#x201a; Greece&#x201a; June 7&#x2212;10&#x201a; 2015</em>.
        
            Vol. 1350
                of CEUR Workshop Proceedings.
        
                Pages 380&#x2212;383.
            CEUR&#x2212;WS.org.
        2015.
        </p>
	
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            		href="/publications/publication9607-abstract.html">
			Details <span class="sr-only" > about <em> Answering EL Queries in the Presence of Preferences  </em></span> </a> |
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		>
			
	
	<p class="publicationTitle"> <strong>
            Verification of Context&#x2212;Sensitive Knowledge and Action Bases </strong> </p>
	    <p class="publicationAuthors"> <em> Diego Calvanese&#x201a; &#x0130;smail &#x0130;lkan Ceylan&#x201a; Marco Montali and Ario Santoso  </em> </p>
	
	<p class="publicationDetails"> 
            In Eduardo Ferm&#xe9; and Jo&#xe3;o Leite, editors,
             
            <em>
            Proceedings of the 14th European Conference on Logics in Artificial Intelligence&#x201a; JELIA 2014&#x201a; Funchal&#x201a; Madeira&#x201a; Portugal&#x201a; September 24&#x2212;26&#x201a; 2014.</em>.
        
            Vol. 8761
                of Lecture Notes in Computer Science.
        
                Pages 514&#x2013;528.
            Springer.
        2014.
        </p>
	
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            		href="/publications/publication11628-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            Tight Complexity Bounds for Reasoning in the Description Logic BEL </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan and Rafael Pe&#xf1;aloza  </em> </p>
	
	<p class="publicationDetails"> 
            In Eduardo Ferm&#xe9; and Jo&#xe3;o Leite, editors,
             
            <em>
            Proceedings of the 14th European Conference on Logics in Artificial Intelligence&#x201a; JELIA 2014&#x201a; Funchal&#x201a; Madeira&#x201a; Portugal&#x201a; September 24&#x2212;26&#x201a; 2014.</em>.
        
            Vol. 8761
                of Lecture Notes in Computer Science.
        
                Pages 77&#x2013;91.
            Springer.
        2014.
        </p>
	
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            		href="/publications/publication11627-abstract.html">
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	<p class="publicationTitle"> <strong>
            Bayesian Description Logics </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan and Rafael Pe&#xf1;aloza  </em> </p>
	
	<p class="publicationDetails"> 
            In Meghyn Bienvenu&#x201a; Magdalena Ortiz&#x201a; Riccardo Rosati and Mantas Simkus, editors,
             
            <em>
            Proceedings of the 27th International Workshop on Description Logics&#x201a; &#x201a; DL 2014&#x201a; Vienna&#x201a; Austria&#x201a; July 17&#x2212;20&#x201a; 2014</em>.
        
            Vol. 1193
                of CEUR Workshop Proceedings.
        
                Pages 447&#x2013;458.
            CEUR&#x2212;WS.org.
        2014.
        </p>
	
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            		href="/publications/publication11626-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            The Bayesian Description Logic BEL </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan and Rafael Pe&#xf1;aloza  </em> </p>
	
	<p class="publicationDetails"> 
            In St&#xe9;phane Demri&#x201a; Deepak Kapur and Christoph Weidenbach, editors,
             
            <em>
            Proceedings of 7th International Joint Conference on Automated Reasoning&#x201a; IJCAR 2014&#x201a; Held as Part of the Vienna Summer of Logic&#x201a; VSL 2014&#x201a; Vienna&#x201a; Austria&#x201a; July 19&#x2212;22&#x201a; 2014</em>.
        
            Vol. 8562
                of Lecture Notes in Computer Science.
        
                Pages 480&#x2013;494.
            Springer.
        2014.
        </p>
	
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            		href="/publications/publication11625-abstract.html">
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		>
			
	
	<p class="publicationTitle"> <strong>
            Reasoning in the Description Logic BEL Using Bayesian Networks </strong> </p>
	    <p class="publicationAuthors"> <em> &#x0130;smail &#x0130;lkan Ceylan and Rafael Pe&#xf1;aloza  </em> </p>
	
	<p class="publicationDetails"> 
            In  
            <em>
            Statistical Relational Artificial Intelligence&#x201a; Papers from the 2014 AAAI Workshop&#x201a; Qu&#xe9;bec City&#x201a; Qu&#xe9;bec&#x201a; Canada&#x201a; July 27&#x201a; 2014</em>.
        
            Vol. WS&#x2212;14&#x2212;13
                of AAAI Workshops.
        AAAI.
        2014.
        </p>
	
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            		href="/publications/publication11624-abstract.html">
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	<p class="publicationTitle"> <strong>
             </strong> </p>
	    <p class="publicationAuthors"> <em>   </em> </p>
	
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