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Changing Left Comodules into Right Comodules via the Antipode, and Comodule Tensor Products
Let $H$ be a Hopf algebra, with invertible antipode, and let $(M,\Delta_M)$ and $(N,\Delta_N)$ be two left $H$-comodules. Now as we all know, we have a left $H$-comodule structure …
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When is a Surjective Comodule Endomorphism an Automorphism?
Given a Hopf algebra $H$, a left $H$-comodule $V$, and a surjective comodule endomorphism $f: V \to V$. Can somebody give:
(i) a set of neccessary, or sufficient, or both neccess …
