Tannaka-Krein duality for Hopf algebroids
Abstract
We develop the Tannaka-Krein duality for monoidal functors with target in the categories of bimodules over a ring. The of such a functor turns out to be a Hopf algebroid over this ring. Using the result of a previous paper we characterize a small abelian, locally finite rigid monoidal category as the category of rigid comodules over a transitive Hopf algebroid.
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