We devise an approximation-preserving reduction of expansion O between weighted and unweighted versions of a class of problems called weighted hereditary induced-subgraph maximisation problems. This allows us to perform a first improvement of the best approximation ratio for the weighted...

Dans ce papier, nous presentons un certain nombre de techniques qui peuvent etre derivees de l'algorithme de Kohonen, telles que la representation des contenus des classes, la visualisation des distances entre les classes, une rapide et robuste classification a deux niveaux emboites bases sur...

We introduce here extensive form games which are the most accurate way of describing a strategic situation. We show how this model finds its place in the hallmark of strategic games. We give a proof of Kuhn's fundamental theorem for games of perfect recall, that is: every mixed strategy is...

In this paper, we show that the third inverse stochastic dominances introduced by Muliere and Scarsini (1989) is nicely connected with the Yaari's dual model. We show especially that the third inverse stochastic dominance is closely linked with the non-negativity of third derivative of the...

This paper investigates the stability of households' consumption behaviour in France through a prcedure of discriminating between feedback and feedforward models connected to the notions of encompassing in invariance initially proposed by Hendry (1988).

This paper presents a surprising example. It shows that lattice theoretic properties in Mas-Colell's (1986) seminal work are relevant to the existence of equilibrium problem even when commodity space is finite dimensional. The paper provides an example of an economy with three commodities and...

In order to get rid of the condition X=Y, we introduce an extension of the Dynkin game by allowing for an extended set of strategies, namely the set of mixed strategies. The main result of the paper is that the extended Dynkin game has a value when the processes X and Y are only restricted to be...