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Emil Weydert

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8 papers
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8

JAAMAS Journal 2026 Journal Article

Utilitarian Desires

  • Jérôme Lang
  • Leendert van der Torre
  • Emil Weydert

Abstract Autonomous agents reason frequently about preferences such as desires and goals. In this paper we propose a logic of desires with a utilitarian semantics, in which we study nonmonotonic reasoning about desires and preferences based on the idea that desires can be understood in terms of utility losses (penalties for violations) and utility gains (rewards for fulfillments). Our logic allows for a systematic study and classification of desires, for example by distinguishing subtly different ways to add up these utility losses and gains. We propose an explicit construction of the agent's preference relation from a set of desires together with different kinds of knowledge. A set of desires extended with knowledge induces a set of ‘distinguished’ utility functions by adding up the utility losses and gains of the individual desires, and these distinguished utility functions induce the preference relation.

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ECAI Conference 2006 Conference Paper

Acyclic Argumentation: Attack = Conflict + Preference

  • Souhila Kaci
  • Leendert W. N. van der Torre
  • Emil Weydert

In this paper we study the fragment of Dung's argumentation theory in which the strict attack relation is acyclic. We show that every attack relation satisfying a particular property can be represented by a symmetric conflict relation and a transitive preference relation in the following way. We define an instance of Dung's abstract argumentation theory, in which 'argument A attacks argument B' is defined as 'argument A conflicts with argument B' and 'argument A is at least as preferred as argument B', where the conflict relation is symmetric and the preference relation is transitive. We show that this new preference-based argumentation theory characterizes the acyclic strict attack relation, in the sense that every attack relation defined as such a combination satisfies the property, and for every attack relation satisfying the property we can find a symmetric conflict relation and a transitive preference relation satisfying the equation.

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IJCAI Conference 2003 Conference Paper

Hidden Uncertainty in the Logical Representation of Desires

  • Jerome Lang
  • Leendert van der Torre
  • Emil Weydert

In this paper we introduce and study a logic of desires. The semantics of our logic is defined by means of two ordering relations representing preference and normality as in Boutilier's logic QDT. However, the desires are interpreted in a different way: "in context A, I desire B" is interpreted as "the best among the most normal worlds are preferred to the most normal worlds". We study the formal properties of these desires, illustrate their expressive power on several classes of examples and position them with respect to previous work in qualitative decision theory.

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NMR Workshop 2002 Conference Paper

Default epistemology rankings, reasoning and revision (a very preliminary account)

  • Emil Weydert

There are well-known links between default reasoning and belief revision. However, previous work has been mainly concerned with the relation between default conditional logics and single-step revision. But this is only the tip of the iceberg. In this paper, we want to go beyond these initial considerations and explore how to derive iterated revision strategies from nonmonotonic default inference. We first take a general perspective before we focus on some instances of cross-fertilization within extensions of Spohn’s ranking paradigm.

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