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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

  • 2018-12-06, 10:15, 4050

    Grzegorz Pierczyński (Instytu)

    Approval-based elections and distortion of voting rules

    We consider elections where both voters and candidates can be associated with points in a metric space and each voter prefers candidates that are closer to him/her to those that are further away. Such a metric space can be e.g. an issue space of their political views. We will measure the quality...

  • 2018-11-22, 10:15, 4050

    Oskar Skibski (Instytut Informatyki, UW)

    Attachment Centrality: Properties and Computation

    Centrality indices aim to quantify the importance of nodes or edges in a network. Much interest has been recently raised by the body of work in which a node’s connectivity is understood less as its contribution to the quality or speed of communication in the network and more as its role in ena...

  • 2018-11-08, 10:15, 4050

    Tomasz Wąs (Instytut Informatyki UW)

    Random Walk Decay Centrality

    We propose a new centrality measure, called the Random Walk Decay centrality. While most centralities in the literature are based on the notion of shortest paths, this new centrality measure stems from the random walk on the network. We provide an axiomatic characterization and show that the new cen...

  • 2018-10-26, 12:15, 4050

    Dominik Peters (Department of Computer Science, University of Oxford)

    Allocation of Indivisible Items with Connected Bundles

    Suppose a collection of indivisible goods are arranged in a line, and we wish to allocate these items to agents so that each agent receives a connected bundle (an interval). This makes sense when the items have a spatial or temporal structure, for example when allocating time slots, and agents are i...

  • 2018-10-18, 10:15, 4050

    Marcin Dziubiński (Instytut Informatyki, UW)

    How to hide in a network

    We propose and study a strategic model of hiding in a network, where the network designer chooses the links and his position in the network facing the seeker who inspects and disrupts the network. We characterize optimal networks for the hider, as well as equilibrium hiding and seeking strategies on...

  • 2018-05-10, 10:15, 4050

    Tomasz Wąs (Instytut Informatyki, UW)

    Axiomatization of the PageRank centrality

    We propose an axiomatization of PageRank. Specifically, we introduce five simple axioms – Foreseeability, Outgoing Homogeneity, Monotonicity, Merging, and Dummy Node – and show that PageRank is the only centrality measure that satisfies all of them. Our axioms give new conceptual and ...

  • 2018-04-12, 10:15, 4050

    Piotr Skowron (Instytut Informatyki UW)

    Approximating Optimal Social Choice under Metric Preferences

    We consider voting under metric preferences: both voters and alternatives are associated with points in a metric space, and each voter prefers alternatives that are closer to her to ones that are further away. In this setting, it is often desirable to select an alternative that minimizes the sum of ...

  • 2018-03-29, 10:15, 4050

    Krzysztof Rządca (Instytut Informatyki, UW)

    Collective Schedules: Scheduling Meets Computational Social Choice

    When scheduling public works or events in a shared facility one needs to accommodate preferences of a population. We formalize this problem by introducing the notion of a collective schedule. We show how to extend fundamental tools from social choice theory---positional scoring rules, the Kemeny ru...

  • 2018-03-15, 10:15, 4790

    Jadwiga Sosnowska (Instytut Informatyki UW)

    Path Evaluation and Centralities in Weighted Graphs – An Axiomatic Approach

    We study the problem of extending the classic centrality measures to weighted graphs. Unfortunately, in the existing extensions, paths in the graph are evaluated solely based on their weights, which is a restrictive and undesirable assumption for a variety of settings. Given this, we define a notion...

  • 2018-01-25, 10:15, 4790

    Rahul CS (Instytut Informatyki, UW)

    Group Activity Selection parameterized by the Number of Agent Types

    We study the parameterized complexity of GASP (Group Activity Selection Problem) and its variant gGASP w.r.t. the number of different agent types as a parameter. We show that GASP can be solved in polynomial time if the number of agent types is a constant and complement this result with a strong par...