Globalization theorems for partial Hopf (co)actions, and some of their applications

By Marcelo Muniz Silva Alves, Eliezer Batista. 2010

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Partial actions of Hopf algebras can be considered as a generaliza- tion of partial actions of groups on algebras. Among important properties of partial Hopf actions, it is possible to prove the existence of enveloping actions, i.e., every partial Hopf action on an algebra A is induced by a Hopf action on an algebra B that contains A as a right ideal. This globalization theo- rem allows to extend several results from the theory of partial group actions to the Hopf algebraic setting. In this article, we prove a dual version of the globalization theorem: that every partial coaction of a Hopf algebra admits an enveloping coaction. We also show how this works on a series of examples which go beyond partial group actions. Finally, we explore some consequences of globalization theorems in order to present versions of the duality theorems of Cohen-Montgomery and Blattner-Montgomery for partial Hopf actions.

Subfields: Algebra and Number Theory, Geometry and Topology, Mathematical Physics

View Paper: https://www.semanticscholar.org/paper/c3eb18565557beea3d6c8c1406a4a7712649e1f1