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Algebra representation of a Hopf algebra

You know what an ordinary (vector space) representation of a Hopf algebra is. It turns out Hopf algebras also have algebra reps with an additional structure over and above the module structure.

Let H be a Hopf algebra. If A is an algebra with the product operation $\mu:A\otimes A\rightarrow A$ , then a linear map $\rho:H\otimes A\rightarrow A$ is an algebra representation of H if, in addition to being a (vector space) rep of H, $μ$ is an H-intertwiner. Recall that $A\otimes A$ is also a vector space rep of H. If A happens to be unital, we'd require that there's an H-intertwiner from ε_H to A such that the 1 of ε_H maps to the unit of A.

Algebra representation of a Lie algebra, Algebra representation of a Lie superalgebra and Algebra representation of a group are all special cases of this more general concept.

Categories: Abstract algebra

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10-26-2009 08:16:03
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Algebra representation of a Hopf algebra