Research

Papers (α-β indicates alphabetical by last name)

Publications

• Beyond Symmetry in Repeated Games with Restarts

Henry Fleischmann, Korinna Fragkia, and Ratip Emin Berker. To appear in Proceedings of the Thirty-Fourth International Joint Conference on Artificial Intelligence (IJCAI-25), Montreal, Canada, 2025. [arXiv]

• Expected Variational Inequalities

Brian Hu Zhang, Ioannis Anagnostides, Emanuel Tewolde, Ratip Emin Berker, Gabriele Farina, Vincent Conitzer, and Tuomas Sandholm. To appear in Proceedings of the Forty-Second International Conference on Machine Learning (ICML-25), Vancouver, Canada, 2025. Spotlight poster (2.6% of submissions) and oral presentation (0.99% of submissions). [arXiv]

• From Independence of Clones to Composition Consistency: A Hierarchy of Barriers to Strategic Nomination

Ratip Emin Berker, Sílvia Casacuberta, Isaac Robinson, Christopher Ong, Vincent Conitzer, Edith Elkind. In Proceedings of the 26th ACM Conference on Economics and Computation (EC-25), Stanford, CA, USA, 2025. [Proceedings, arXiv]

• Learning and Computation of Φ-Equilibria at the Frontier of Tractability

Brian Hu Zhang, Ioannis Anagnostides, Emanuel Tewolde, Ratip Emin Berker, Gabriele Farina, Vincent Conitzer, and Tuomas Sandholm. In Proceedings of the 26th ACM Conference on Economics and Computation (EC-25), Stanford, CA, USA, 2025. [Proceedings, arXiv]

• The Value of Recall in Extensive-Form Games

Ratip Emin Berker, Emanuel Tewolde, Ioannis Anagnostides, Tuomas Sandholm, and Vincent Conitzer.Proceedings of the Thirty-Ninth AAAI Conference on Artificial Intelligence (AAAI-25), Philadelphia, Pennsylvania, USA, 2025. Oral presentation (4.63% of submissions). [Proceedings, arXiv]

• Computing Optimal Equilibria in Repeated Games with Restarts 

Ratip Emin Berker and Vincent Conitzer.Proceedings of the Thirty-Third International Joint Conference on Artificial Intelligence (IJCAI-24), Jeju, South Korea, 2024. [Proceedings, arXiv]

Workshop Papers

• Obvious Independence of Clones

Ratip Emin Berker, Sílvia Casacuberta Puig, Christopher Ong, and Isaac Robinson. In the 4th International Workshop on Democracy and AI (DemocracAI 2024) at IJCAI 2024. Best student paper award. [Proceedings, arXiv]

• How To Filter Out Malicious Encrypted Gradients in Federated Learning

(α-β) Ratip Emin Berker, Jordan Barkin, Sílvia Casacuberta Puig, and Janet Li. In the 5th AAAI Workshop on Privacy-Preserving Artificial Intelligence (PPAI-24) at AAAI 2024. 

Manuscripts

• Quantum and Classical Algorithms for Bounded Distance Decoding,

(α-β) Richard Allen, Ratip Emin Berker, Sílvia Casacuberta Puig, and Michael Gul. IACR ePrint, 2022.

Competition reports

• Agreement-Based Aggregation of Rankings,

Ratip Emin Berker, Boğaçhan Arslan, and Sinan Karaböcüoğlu. The 2nd Computational Social Choice Competition (COMPSOC 2024) at IJCAI-24. Third place award. 

Talks

• Computing Optimal Equilibria in Repeated Games with Restarts, Dynamic Systems Seminar, Imperial College London (UK), June 2025.

• From Independence of Clones to Composition Consistency, Technical University of Munich (Germany). May 2025.

• Cooperative Artificial Intelligence: Using Game Theory and Computer Science for Building Safe Multi-Agent Systems, Robert College (Turkey). May 2025.

• The Value of Recall in Extensive-Form Games (event page), University of Chicago (USA). May 2025. 

• Designing Rules to Pick a Rule: Aggregation by Consistency, Theory Seminar, Northwestern University (USA). May 2025.

• From Independence of Clones to Composition Consistency, EconCS Seminar, Carnegie Mellon University (USA), March 2025.

• The Value of Recall in Extensive-Form Games, AAAI-25, Philadelphia (USA), March 2025. 

• From Independence of Clones to Composition Consistency, Workshop on Economics of Modern ML: Markets, Incentives, and Generative AI. Philadelphia (USA), March 2025. 

• Games with Imperfect Recall: Equilibrium Concepts, Value of Recall, and Computational Considerations, EconCS Seminar, Carnegie Mellon University (USA), February 2025. With Emanuel Tewolde.

• Agreement-based Aggregation of Rankings, Institute for Complex Social Dynamics Workshop, Pittsburgh, January 2025.

• Computing Optimal Equilibria in Repeated Games with Restarts, IJCAI-24, Jeju (South Korea), August 2024.

• Obvious Independence of Clones, 4th International Workshop on Democracy and AI (DemocrAI) , Jeju (South Korea), August 2024.

• Social Choice Should Guide AI Alignment in Dealing with Diverse Human Feedback, 1st International Workshop on AI Governance (AIGOV), Jeju (South Korea), August 2024. On behalf of Emanuel Tewolde.

• Tutorial on Repeated Games with Restarts, the fourth Human-aligned AI Summer School, Prague (Czech Republic), July 2024. [Video]

• Foundations of Cooperative AI, the fourth Human-aligned AI Summer School (Invited Speaker), Prague (Czech Republic), July 2024.

• Computing Optimal Equilibria in Repeated Games with Restarts, Algorithmic Game Theory Seminar, University of Oxford (UK), June 2024.

• Computing Optimal Equilibria in Repeated Games with Restarts, Theory Lunch, Carnegie Mellon University (USA), February 2024.

• Obvious Independence of Clones, 38th International Physics Congress Of The Turkish Physical Society, Bodrum (Turkey), September 2022.

• Neural Networks for Materials Science, Harvard-Radcliffe Society of Physics Students Undergraduate Chalk Talks, Harvard University (USA), October 2021.