Talk:Representation theory of Hopf algebras

This will hold for any three H-modules if $$\Delta$$ satisfies $$(\operatorname{id}\otimes \Delta)\Delta A=(\Delta \otimes \operatorname{id})\Delta A$$.

What does the A do here? -- Darij (talk) 13:36, 22 July 2009 (UTC)

It should be explicitly stated that all tensor product are over the base field, otherwise it might seem that we are taking the tensor product over H, even if it doesn't make sense. 193.52.24.2 (talk) 16:42, 23 November 2011 (UTC)