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Documents authored by Aucher, Guillaume

Document
DOI: 10.4230/DagRep.9.1.47
Conditional Logics and Conditional Reasoning: New Joint Perspectives (Dagstuhl Seminar 19032)

Authors: Guillaume Aucher, Paul Egré, Gabriele Kern-Isberner, and Francesca Poggliesi

Published in: Dagstuhl Reports, Volume 9, Issue 1 (2019)

Abstract
In the last decades, with the emergence of artificial intelligence, a large number of logics called conditional logics have been introduced to model our conditional reasoning captured by so--called conditionals, which are statements of the form `if A then B'. More recently, conditional reasoning has also come under scrutiny by psychologists, yet with more pragmatic and empirical considerations. The main objective of this seminar was to provide an opportunity for these different communities working on that topic to meet and reinforce their ties. We focused on three specific issues. First, we investigated how people's intuitions about `counterpossibles' can be understood empirically and classified with respect to the theoretical accounts of conditional logics. Second, we reconsidered the various semantics of system P and we wondered to which extent pragmatics plays a role in the relevance relation between the antecedant and the consequent of a conditional. Third, we strove to apply the recent advances in proof theory and correspondence theory to conditional logics. These working groups were preceded by short talks and tutorials.
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Guillaume Aucher, Paul Egré, Gabriele Kern-Isberner, and Francesca Poggliesi. Conditional Logics and Conditional Reasoning: New Joint Perspectives (Dagstuhl Seminar 19032). In Dagstuhl Reports, Volume 9, Issue 1, pp. 47-66, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)

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@Article{aucher_et_al:DagRep.9.1.47,
  author =	{Aucher, Guillaume and Egr\'{e}, Paul and Kern-Isberner, Gabriele and Poggliesi, Francesca},
  title =	{{Conditional Logics and Conditional Reasoning: New Joint Perspectives (Dagstuhl Seminar 19032)}},
  pages =	{47--66},
  journal =	{Dagstuhl Reports},
  ISSN =	{2192-5283},
  year =	{2019},
  volume =	{9},
  number =	{1},
  editor =	{Aucher, Guillaume and Egr\'{e}, Paul and Kern-Isberner, Gabriele and Poggliesi, Francesca},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagRep.9.1.47},
  URN =		{urn:nbn:de:0030-drops-105693},
  doi =		{10.4230/DagRep.9.1.47},
  annote =	{Keywords: Commonsense reasoning, conditionals, correspondence theory, proof theory, psychology of reasoning}
}
Document
DOI: 10.4230/DagSemProc.09121.14
Dynamic Context Logic and its Application to Norm

Authors: Guillaume Aucher, Davide Grossi, Andreas Herzig, and Emiliano Lorini

Published in: Dagstuhl Seminar Proceedings, Volume 9121, Normative Multi-Agent Systems (2009)

Abstract
Building on a simple modal logic of context, the paper presents a dynamic logic characterizing operations of contraction and expansion on theories. We investigate the mathematical properties of the logic, and use it to develop an axiomatic and semantic analysis of norm change in normative systems. The proposed analysis advances the state of the art by providing a formal semantics of norm-change which, at the same time, takes into account several different aspects of the phenomenon, such as permission and obligation dynamics, as well as the dynamics of classificatory rules.
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Guillaume Aucher, Davide Grossi, Andreas Herzig, and Emiliano Lorini. Dynamic Context Logic and its Application to Norm. In Normative Multi-Agent Systems. Dagstuhl Seminar Proceedings, Volume 9121, pp. 1-13, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2009)

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@InProceedings{aucher_et_al:DagSemProc.09121.14,
  author =	{Aucher, Guillaume and Grossi, Davide and Herzig, Andreas and Lorini, Emiliano},
  title =	{{Dynamic Context Logic and its Application to Norm}},
  booktitle =	{Normative Multi-Agent Systems},
  pages =	{1--13},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2009},
  volume =	{9121},
  editor =	{Guido Boella and Pablo Noriega and Gabriella Pigozzi and Harko Verhagen},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.09121.14},
  URN =		{urn:nbn:de:0030-drops-19009},
  doi =		{10.4230/DagSemProc.09121.14},
  annote =	{Keywords: Context logic, norm change, deontic logic}
}
Document
DOI: 10.4230/DagSemProc.07351.5
A logical formalism for the subjective approach in a multi-agent setting

Authors: Guillaume Aucher

Published in: Dagstuhl Seminar Proceedings, Volume 7351, Formal Models of Belief Change in Rational Agents (2007)

Abstract
Representing an epistemic situation involving several agents depends very much on the modeling point of view one takes. In fact, the interpretation of a formalism relies quite a lot on the nature of this modeling point of view. Classically, in epistemic logic, the models built are supposed to represent the situation from an external and objective point of view. We call this modeling approach the objective approach. In this paper, we study the modeling point of view of a particular agent involved in the situation with other agents. We propose a logical formalism based on epistemic logic that this agent can use to represent `for herself' the surrounding world. We call this modeling approach the subjective approach. We then set some formal connections between the subjective approach and the objective approach. Finally we axiomatize our logical formalism and show that the resulting logic is decidable.
Cite as

Guillaume Aucher. A logical formalism for the subjective approach in a multi-agent setting. In Formal Models of Belief Change in Rational Agents. Dagstuhl Seminar Proceedings, Volume 7351, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2007)

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@InProceedings{aucher:DagSemProc.07351.5,
  author =	{Aucher, Guillaume},
  title =	{{A logical formalism for the subjective approach in a multi-agent setting}},
  booktitle =	{Formal Models of Belief Change in Rational Agents},
  series =	{Dagstuhl Seminar Proceedings (DagSemProc)},
  ISSN =	{1862-4405},
  year =	{2007},
  volume =	{7351},
  editor =	{Giacomo Bonanno and James Delgrande and J\'{e}r\^{o}me Lang and Hans Rott},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.07351.5},
  URN =		{urn:nbn:de:0030-drops-12002},
  doi =		{10.4230/DagSemProc.07351.5},
  annote =	{Keywords: Epistemic logic, multi-agent system}
}
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