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We show that the (co)endomorphism algebra of a sufficiently separable ``fibre'' functor into $Vect_k$, for $k$ a field of characteristic 0, has the structure of what we call a ``unital'' von Neumann core in $Vect_k$. For $Vect_k$, this particular notion of algebra is weaker than that of a Hopf algebra, although the corresponding concept in $Set$ is again that of a group.
@article{TAC_2009_22_a3, author = {Brian Day and Craig Pastro}, title = {On endomorphism algebras of separable monoidal functors}, journal = {Theory and applications of categories}, pages = {77--96}, publisher = {mathdoc}, volume = {22}, year = {2009}, language = {en}, url = {http://geodesic.mathdoc.fr/item/TAC_2009_22_a3/} }
Brian Day; Craig Pastro. On endomorphism algebras of separable monoidal functors. Theory and applications of categories, Tome 22 (2009), pp. 77-96. http://geodesic.mathdoc.fr/item/TAC_2009_22_a3/