Concurrent Strategies as Street Fibrations

Hugo Paquet; Glynn Winskel

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arXiv · 2609.37815

Concurrent Strategies as Street Fibrations

Hugo Paquet·Glynn Winskel

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Abstract

Concurrent games and strategies based on event structures are an established and expressive model of interactive computation. In this paper we revisit the problem of equipping this model with symmetry. Symmetry is essential for many applications, but it is also a source of mathematical complexity, not least because strategies with symmetry can be compared up to several distinct notions of equivalence. Our first contribution is a complete characterization of two classes of strategies for which composition admits an identity. For these two classes the identity laws hold, respectively, up to a "weak" and a "strong" notion of equivalence. The main result is that the weak class of strategies corresponds precisely to those inducing Street fibrations over the game. We also show how the established "thin" approach to symmetry also fits in this general framework. A second contribution is a formal connection between games and setoid-valued profunctors. This follows a long tradition of relating games and relational models, but here additionally includes a very general model of symmetries. Our characterization of strategies as Street fibrations makes the connection to profunctors significantly easier to establish.

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Hugo Paquet, Glynn Winskel. 2026-09-29. Concurrent Strategies as Street Fibrations. https://arxiv.org/abs/2609.37815

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