Mathematics – Category Theory
Scientific paper
2011-12-06
Mathematics
Category Theory
15 pages
Scientific paper
We functorially characterize groupoids as special dagger Frobenius algebras
in the category of sets and relations. This is then generalized to a non-unital
setting, by establishing an adjunction between H*-algebras in the category of
sets and relations, and locally cancellative regular semigroupoids. Finally, we
study a universal passage from the former setting to the latter.
Cattaneo Alberto S.
Contreras Ivan
Heunen Chris
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