cycle construction for symmetric monoidal categories #2134
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In this PR, we introduce what I've termed the "cycle construction" for symmetric monoidal categories. Like the "twist construction" it is a slicker way to build symmetric monoidal categories without having to give all the data from the beginning. But this time, instead of asking for a twist map ABC -> BAC we ask for a cycle map ABC -> CAB. We then have variants of the hexagon and pentagon axioms which appear to be slicker than in the twist construction.
TODO