PhD Defence of Rachael Colley

Morning Schedule

PhD Defence of Rachael Colley
Title: Expressive and Rational Delegations in Voting.
Time: 10 am – 1 pm
Location: Salle des Thèses, the ground floor of the Arsenal building
(2 Rue du Doyen Gabriel Marty, 31000 Toulouse)

Afternoon Schedule

In the afternoon, we will have a workshop on computational social choice.
Time: 3 pm
Location: MF105 at the Manufacture des Tabacs campus
(21 All. de Brienne, 31015 Toulouse)

Schedule

• 15h – 15h45 Arianna Novaro, CES, Université Paris 1 Panthéon-Sorbonne
  Title: Repeated Fair Allocation of Indivisible Items
  Abstract
  The problem of fairly allocating a set of indivisible items is a well-known challenge in the field of (computational) social choice. In this scenario, there is a fundamental incompatibility between notions of fairness (such as envy-freeness and proportionality) and economic efficiency (such as Pareto-optimality). However, in the real world, items are not always allocated once and for all, but often repeatedly. For example, the items may be recurring chores to distribute in a household. Motivated by this, we have initiated the study of the repeated fair division of indivisible goods and chores and we have proposed a formal model for this scenario. In this talk, I will discuss some initial results on the (im)possibility of obtaining fairness guarantees in this new framework.
  (Joint work with Ayumi Igarashi, Martin Lackner, Oliviero Nardi).

• 15h45- 16h15: Coffee Break

• 16h15- 17h Richard Booth, Cardiff University
  Title: Who’s the Expert? On Multi-source Belief Change
  Abstract
  Consider the following belief change/merging scenario. A group of information sources gives a sequence of reports about the state of the world at various instances (e.g. different points in time). The true states at these instances are unknown to us. The sources have varying levels of expertise, also unknown to us, and may be knowledgeable on some topics but not others. This may cause sources to report false statements in areas they lack expertise. What should we believe on the basis of these reports? We provide a framework in which to explore this problem, based on an extension of propositional logic with expertise formulas. This extended language allows us to express beliefs about the state of the world at each instance, as well as beliefs about the expertise of each source. We propose several postulates, provide a couple of families of concrete operators, and analyse these operators with respect to the postulates. This is joint work with Joe Singleton.

Celebrations

After the workshop, we will be celebrating at the Botanist (33 Bd Maréchal Leclerc, 31000 Toulouse -about a 5-minute walk away).