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Wydział Matematyki, Informatyki i Mechaniki Uniwersytetu Warszawskiego

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Seminar Games, Mechanisms, and Social Networks

Weekly research seminar

List of talks

  • 2024-02-01, 12:00, seminarium online

    Tomáš Masařík (University of Warsaw)

    A Generalised Theory of Proportionality in Collective Decision Making

    We consider a voting model, where a number of candidates need to be selected subject to certain feasibility constraints. The model generalises committee elections (where there is a single constraint on the number of candidates that need to be selected), various elections with diversity constraints, ...

  • 2024-01-25, 12:15, online

    Piotr Faliszewski (AGK University of Science and Technology)

    Guide to Experiments in COMSOC

    In this talk I will discuss how numerical experiments on elections were typically performed in computational social choice and what we can learn from it. In particular, we will see what election sizes were considered and what statistical cultures were used etc. Further, we will analyze which choices...

  • 2023-12-07, 10:15, online

    Tomasz Wąs (LAMSADE, Paryż)

    Fairly Allocating Goods and (Terrible) Chores

    We study the fair allocation of mixtures of indivisible goods and chores under lexicographic preferences—a subdomain of additive preferences. A prominent fairness notion for allocating indivisible items is envy-freeness up to any item (EFX). Yet, its existence and computation has remained a no...

  • 2023-11-30, 12:15, 4050

    Marcin Dziubiński (University of Warsaw)

    Interconnected Battles

    We study a model of multibattle contest with two players and spillovers of efforts between battles. The players distribute their costly efforts across the battles. Each battle receives effort assigned to it directly (real efforts) as well as spillovers of efforts assigned to the other...

  • 2023-11-23, 12:15, 4050

    Marcin Waniek (University of Warsaw)

    Modelling global market access using networks

    In this (very much in progress) work we use network science techniques to model access of different locations around the world to the global market. It was shown in the literature that it is possible to surprisingly accurately predict the economic activity in a specific place (measured via the inten...

  • 2023-11-09, 12:00, online seminar

    Grzegorz Lisowski (AGH University of Science and Technology)

    Strategic Cost Selection in Participatory Budgeting

    We study strategic behaviour of project proposers in the  context of approval-based participatory budgeting, assuming that the votes are fixed and known and the proposers want to set as high project prices as possible, provided that their projects get selected and the prices are ...

  • 2023-10-19, 12:15, 4050

    Georgios Papasotiropoulos (Athens University of Economics and Business)

    Conditional Approval Voting: Winner Determination, Strategic Control and Proportionality Considerations

    Picture a group of friends in Warsaw deciding on a shared meal: a starter and a main course. One among them loves pierogi and would like to go for bigos afterwards--easy to vote for in the classical approval voting setting. Meanwhile, another in the group, while also ap...

  • 2023-10-09, 10:15, 4050

    Makoto Yokoo (Kyushu University)

    Matching Market Design with Constraints

    Two-sided matching deals with finding a desirable combination of two parties, e.g., students and colleges, workers and companies, and medical residents to hospitals. Beautiful theoretical results on two-sided matching have been obtained, i.e., the celebrated Deferred Acceptance m...

  • 2023-10-05, 12:00, online

    Oskar Skibski (University of Warsaw)

    Vitality Indices and Game-Theoretic Centralities

    Vitality indices form a natural class of centrality measures that assess the importance of a node based on the impact its removal has on the network. In this talk, we will discuss the connection between vitality indices and game-theoretic centrality measures, which are centrality measures defined ba...

  • 2023-06-22, 12:00, s. zdalne

    Jarosław Flis (Uniwersytet Jagielloński)

    Ordynacja Proporcjonalno-Lokalna - ordynacja dla Polski?

    Opracowanie to przedstawia oryginalny projekt ordynacji proporcjonalno-lokalnej (dalej „ordynacji PL”), będący odpowiedzią na postulat wprowadzenia w Polsce ordynacji mieszanej. Proponowany system jest możliwie zbliżony do obecnego, choć jednocześnie wprowadza starannie przemyśla...