one forms the Heisenberg double corresponding to these data as the crossed product algebra (“smash product”) associated to the Hopf action .
For example if is the symmetric (Hopf) algebra on a finite-dimensional vector space , and its algebraic dual , considered as its dual topological Hopf algebra, the result is the Weyl algebra of regular differential operators, completed with respect to the filtration corresponding to the degree of differential operator. If is just the finite dual of which is a usual Hopf algebra, then there is no completion, of course.
In the following paper there is an example showing that the Heisenberg double has a structure of a Hopf algebroid over ; moreover can be replaced by any module algebra over the Drinfel'd double :
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