Categories of impartial rulegraphs and gamegraphs

Bojan Bašić (), Paul Ellis (), Dana C. Ernst (), Danijela Popović () and Nándor Sieben ()
Additional contact information
Bojan Bašić: University of Novi Sad
Paul Ellis: Rutgers University
Dana C. Ernst: Northern Arizona University
Danijela Popović: Mathematical Institute of the Serbian Academy of Sciences and Arts
Nándor Sieben: Northern Arizona University

International Journal of Game Theory, 2024, vol. 53, issue 4, No 15, 1407-1433

Abstract: Abstract The traditional mathematical model for an impartial combinatorial game is defined recursively as a set of the options of the game, where the options are games themselves. We propose a model called gamegraph, together with its generalization rulegraph, based on the natural description of a game as a digraph where the vertices are positions and the arrows represent possible moves. Such digraphs form a category where the morphisms are option preserving maps. We study several versions of this category. Our development includes congruence relations, quotients, and isomorphism theorems and is analogous to the corresponding notions in universal algebra. The quotient by the maximum congruence relation produces an object that is essentially equivalent to the traditional model. After the development of the general theory, we count the number of non-isomorphic gamegraphs and rulegraphs by formal birthday and the number of positions.

Keywords: Option preserving map; Congruence relation; Minimum quotient; Valuation; 91A46; 91A43; 05C57; 08A30 (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1007/s00182-024-00921-3

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