Abstract
We prove a coherence theorem for invertible objects in a symmetric monoidal category (or equivalently, a coherence theorem for symmetric categorical groups). This is used to deduce associativity, skew-commutativity, and related results for multigraded morphism rings, generalizing the well-known versions for stable homotopy groups.
Citation
Daniel Dugger. "Coherence for invertible objects and multigraded homotopy rings." Algebr. Geom. Topol. 14 (2) 1055 - 1106, 2014. https://doi.org/10.2140/agt.2014.14.1055
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