De-equivariantization of Hopf algebras
  We study the de-equivariantization of a Hopf algebra by an affine group scheme and we apply Tannakian techniques in order to realize it as the tensor category of comodules over a coquasi-bialgebra. As an application we construct a family of coquasi-Hopf algebras $A(H,G,\Phi)$ attached to a coradically-graded pointed Hopf algebra $H$ and some extra data. 
Iv\'an Angiono, C\'esar Galindo and Mariana Pereira
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