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arXiv · 2309.15981

A categorical representation of games

Fernando Tohmé·Ignacio Viglizzo
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Abstract

Strategic games admit a multi-graph representation, in which two kinds of relations, accessibility, and preferences, are used to describe how the players compare the possible outcomes. A category of games with a fixed set of players $\mathbf{Gam}_I$ is built from this representation, and a more general category $\mathbf{Gam}$ is defined with games having different sets of players, both being complete and cocomplete. The notion of Nash equilibrium can be generalized in this context. We then introduce two subcategories of $\mathbf{Gam}$, $\mathbf{NE}$ and $\mathbf{Gam}^{NE}$ in which the morphisms are equilibria-preserving. We illustrate the expressivity and usefulness of this framework with some examples.

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Fernando Tohmé, Ignacio Viglizzo. 2023-09-27. A categorical representation of games. https://arxiv.org/abs/2309.15981

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