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Rewriting in Free Hypergraph Categories

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arxiv 1712.09495 v2 pith:MKJJTKRQ submitted 2017-12-27 cs.LO

classification cs.LO
keywords categoriesrewritinghypergraphfreefrobeniushypergraphscategoryobject
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We study rewriting for equational theories in the context of symmetric monoidal categories where there is a separable Frobenius monoid on each object. These categories, also called hypergraph categories, are increasingly relevant: Frobenius structures recently appeared in cross-disciplinary applications, including the study of quantum processes, dynamical systems and natural language processing. In this work we give a combinatorial characterisation of arrows of a free hypergraph category as cospans of labelled hypergraphs and establish a precise correspondence between rewriting modulo Frobenius structure on the one hand and double-pushout rewriting of hypergraphs on the other. This interpretation allows to use results on hypergraphs to ensure decidability of confluence for rewriting in a free hypergraph category. Our results generalise previous approaches where only categories generated by a single object (props) were considered.

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  1. Guarded Realization Semantics: Occurrence-Sensitive Certificates and Behavior-Dependent Lower Bounds

    math.CT 2026-07 conditional novelty 6.0 of 10

    Under stated guards, every realization satisfies Q(O(Err(r))) ≤ A(Err(r)) ≤ U(r), with U from occurrence-sensitive certificates and Q from behavior-fiber or quotient-norm reflection.

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