The Category Gm for Extensive-Form Games

Peter A. Streufert

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arXiv · 2105.11398

The Category Gm for Extensive-Form Games

Peter A. Streufert

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Abstract

This paper introduces $\mathbf{Gm}$, which is a category for extensive-form games. The category's objects are extensive-form games, each of which is regarded as a set of nodes which has been endowed with edges, information sets, actions, players, and utility functions. Its morphisms are functions, from source nodes to target nodes, that respect this structure. For instance, a game's information-set collection is newly regarded as a topological basis for the game's decision-node set, and then a morphism's continuity serves to respect the source game's information sets. Given these definitions, a game isomorphism is characterized as a bijection whose restriction to decision nodes is a homeomorphism, whose induced player transformation is bijective, and whose induced run transformation is monotonic with respect to the total preorder determined by each player's utility function.

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Peter A. Streufert. 2021-05-24. The Category Gm for Extensive-Form Games. https://arxiv.org/abs/2105.11398

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