this is me, giorgos

giorgos papasotiropoulos

the about-me page

the more-about-me page

publications

working papers

  • Proportionality in Thumbs Up and Down Voting. Sonja Kraiczy, Georgios Papasotiropoulos, Grzegorz Pierczyński, Piotr Skowron.
    accepted at the non-archival Workshop on New Directions in Social Choice at EC'25; currently under submission to a conference [paper]
  • Proportional Selection in Networks. Georgios Papasotiropoulos, Oskar Skibski, Piotr Skowron, Tomasz Wąs.
    accepted at the non-archival Workshop on New Directions in Social Choice at EC'25; currently under submission to a conference [paper]
  • Cycles in Liquid Democracy: A Game-Theoretic Justification. Markus Brill, Rachael Colley, Anne-Marie George, Grzegorz Lisowski, Georgios Papasotiropoulos, Ulrike Schmidt-Kraepelin.
    accepted at the non-archival Conference of the European Network for Digital Democracy and, as a poster, at the non-archival Amsterdam/Saint-Etienne Workshop on Social Choice; soon to be under submission to an archival conference [paper]
  • Participatory Budgeting with Donations: The Case of Selective Voters. Philip Lazos, Evangelos Markakis, Georgios Papasotiropoulos. [paper]


conference publications

  • Method of Equal Shares with Bounded Overspending. Georgios Papasotiropoulos, Seyedeh Zeinab Pishbin, Oskar Skibski, Piotr Skowron, Tomasz Wąs. [paper] [slides]
  • The Cost Perspective of Liquid Democracy: Feasibility and Control. Shiri Alouf-Heffetz, Łukasz Janeczko, Grzegorz Lisowski, Georgios Papasotiropoulos.
    In the proceedings of the 39th AAAI Conference on Artificial Intelligence (AAAI '25). [paper]
  • As Time Goes By: Adding a Temporal Dimension Towards Resolving Delegations in Liquid Democracy. Evangelos Markakis, Georgios Papasotiropoulos.
    In the proceedings of the 8th International Conference on Algorithmic Decision Theory
    (ADT '24).
    [paper] [slides]
  • On the Potential and Limitations of Proxy Voting: Delegation with Incomplete Votes. Georgios Amanatidis, Aris Filos-Ratsikas, Philip Lazos, Evangelos Markakis, Georgios Papasotiropoulos.
    In the proceedings of the 23rd International Conference on Autonomous Agents and Multi-Agent Systems (AAMAS'24). [paper] [slides] [poster]
  • Proportionality Guarantees in Elections with Interdependent Issues. Markus Brill, Evangelos Markakis, Georgios Papasotiropoulos, Jannik Peters.
    In the proceedings of the 32nd International Joint Conference on Artificial Intelligence (IJCAI'23). [paper] [slides] [poster]
  • On Improved Interval Cover Mechanisms for Crowdsourcing Markets. Evangelos Markakis, Georgios Papasotiropoulos, Artem Tsikiridis.
    In the proceedings of the 15th International Symposium on Algorithmic Game Theory (SAGT'22). [paper] [slides]
  • An Approval-Based Model for Single-Step Liquid Democracy. Evangelos Markakis, Georgios Papasotiropoulos.
    In the proceedings of the 14th International Symposium on Algorithmic Game Theory (SAGT'21). [paper] [slides]
  • Winner Determination and Strategic Control in Conditional Approval Voting. Evangelos Markakis, Georgios Papasotiropoulos.
    In the proceedings of the 30th International Joint Conference on Artificial Intelligence (IJCAI'21). [paper] [poster]
  • Computational Aspects of Conditional Minisum Approval Voting in Elections with Interdependent Issues. Evangelos Markakis, Georgios Papasotiropoulos.
    In the proceedings of the 29th International Joint Conference on Artificial Intelligence (IJCAI'20). [paper] [presentation]


journal publications

  • On the Complexity of Winner Determination and Strategic Control in Conditional Approval Voting. Evangelos Markakis, Georgios Papasotiropoulos.
    Theoretical Computer Science. [pdf]
  • On the Tractability Landscape of Conditional Minisum Approval Voting Rule. Georgios Amanatidis, Michael Lampis, Evangelos Markakis, Georgios Papasotiropoulos.
    Information Processing Letters--special issue on Economics and Computation.   [paper] [pdf]


miscellanea

  • Liquid Democracy: An Annotated Reading List. Georgios Papasotiropoulos, Ulrike Schmidt-Kraepelin. ACM SIGecom Exchanges. [paper]
  • Delegation: A Small Step for a Voter, a Giant Leap for Democracy. Georgios Papasotiropoulos. Delta Popular Science Magazine. [paper] [english version]
  • Trimmed Ranking Welfare Rules. Roy Fairstein, Georgios Papasotiropoulos, Bin Sun.
    First-prize winner for the 1st Computational Social Choice Competition (IJCAI'23).
    [technical report]