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math.CT2011★ 37 cited
Relative Frobenius algebras are groupoids
Chris Heunen, Ivan Contreras, Alberto S. Cattaneo
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…
math.CT2011★ 36 cited
Pictures of complete positivity in arbitrary dimension
Bob Coecke, Chris Heunen
Two fundamental contributions to categorical quantum mechanics are presented. First, we generalize the CP-construction, that turns any dagger compact category into one with complet…