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Reminder: In a
#monoidal category, the automorphisms of the unit form an#abelian group, by the#EckmannHilton argument. But this does NOT mean that the automorphism groups of other objects are abelian. E.g. GL1(R) vs. GLn(R) for n > 1. -
Very proud of my student, who made major technical contributions to this new paper on infinitary commutativity! https://arxiv.org/pdf/2001.09500.pdf …
#eckmannhilton#cotorsionfreegroupsrule
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