Coherence for Monoidal Endofunctors

Details Coherence for Monoidal Endofunctors Coherence for Monoidal Endofunctors

2009-07-13

arxiv.org/abs/0907.2194v2

Mathematics

Category Theory

22 pages, minor corrections

Scientific paper

The goal of this paper is to prove coherence results with respect to relational graphs for monoidal endofunctors, i.e. endofunctors of a monoidal category that preserve the monoidal structure up to a natural transformation that need not be an isomorphism. These results are proved first in the absence of symmetry in the monoidal structure, and then with this symmetry. In the later parts of the paper the coherence results are extended to monoidal endofunctors in monoidal categories that have diagonal or codiagonal natural transformations, or where the monoidal structure is given by finite products or coproducts. Monoidal endofunctors are interesting because they stand behind monoidal monads and comonads, for which coherence will be proved in a sequel to this paper.

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