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Wydział Matematyki, Informatyki i Mechaniki Uniwersytetu Warszawskiego

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Seminarium „Gry, mechanizmy i sieci społeczne”

Cotygodniowe seminarium badawcze (brak strony WWW)

Lista referatów

  • 2023-06-22, godz. 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...

  • 2023-05-18, godz. 12:15, 4050

    Natalia Kucharczuk (University of Warsaw)

    Group Vitality Indices and the Shapley Value

    We will start the presentation by showing a link between Vitality Indices and Shapley Value-based induced game-theoretic centralities. It is a foundation of our current research regarding extending vitality indices into groups. We propose novel definitions of Group Vitality Indices and Group Shapley...

  • 2023-05-04, godz. 12:00, online

    Grzegorz Pierczyński (University of Warsaw)

    Market-Based Explanations of Collective Decisions

    We consider approval-based committee elections, in which a size-k subset of available candidates must be selected given approval sets for each voter, indicating the candidates approved by the voter. A number of axioms capturing ideas of fairness and proportionality have been proposed for this framew...

  • 2023-03-23, godz. 12:15, 4050

    Jorge Salas (Pontificia Universidad Católica de Chile & University of Edinburgh)

    How Do Centrality Measures Choose the Root of Trees?

    Centrality measures are widely used to assign importance to graph-structured data. Recently, understanding the principles of such measures has attracted a lot of attention. Given that measures are diverse, this research has usually focused on classes of centrality measures. In this work, we provide ...

  • 2023-03-16, godz. 12:15, 4050

    Stanisław Szufa (AGH, Kraków)

    Spoiler Susceptibility in Party Elections

    An electoral spoiler is usually defined as a losing candidate whose removal would affect the outcome by changing the winner. So far spoiler effects have been analyzed primarily for single-winner electoral systems. We consider this subject in the context of party elections, where there is no longe...

  • 2023-03-02, godz. 12:00, 4050

    Sonja Kraiczy (University of Oxford)

    Properties of the Mallows Model Depending on the Number of Alternatives: A Warning for an Experimentalist

    The Mallows model is a popular distribution for ranked data. We empirically and theoretically analyze how the properties of rankings sampled from the Mallows model change when increasing the number of alternatives. We find that real-world data behaves differently than the Mallows model, yet is in li...

  • 2023-02-02, godz. 12:00, zoom meeting

    Oskar Skibski (University of Warsaw)

    Closeness centrality via the Condorcet principle

    We provide a characterization of closeness centrality in the class of distance-based centralities. To this end, we introduce a natural property, called majority comparison, that states that out of two adjacent nodes the one closer to more nodes is more central. We prove that any distance-based centr...

  • 2023-01-12, godz. 12:15, 4050

    Michał Pawłowski (University of Warsaw)

    Optimizing ride-hailing fares using computational microeconomy tools

    Pricing ride-hailing fares sparked a rich line of work in computer science due to its complexity and multidimensionality of aspects. We add to this line of research by considering the model presented by Hikima et al. (AAAI, 2021). For this model, the authors claimed a 3-approximation of the optimum ...

  • 2023-01-05, godz. 12:00, spotkanie online

    Piotr Faliszewski (AGH University in Kraków)

    Map of Elections: Diversity, Polarization, and Agreement In Elections (+ some more)

    In this talk I will present the idea of the map of (ordinal) elections and argue what it is good for. First, we will spend considerable amount of time on understanding diversity, polarization, and agreement within elections on the map. Then, we will look at other applications, such as using the map ...

  • 2022-12-15, godz. 12:15, 4050

    Stanisław Kaźmierowski (University of Warsaw)

    Algorithm for solving the attack and interception game on networks

    The paper "Attack and interception in networks" (F. Bloch, K. Chatterjee, B. Dutta, 2022), describes a game where a single attacker chooses a target and a path and each node chooses a level of protection. Main results proposed in this paper are the existence and uniqueness of NE of the pro...