The lifting conjecture for exact equivariant Morita classes

Let HH be a finite-dimensional Hopf algebra with the dual Chevalley property, let H0H_0 be its coradical, and let X0X_0 be a complete set of exact H0H_0-equivariant Morita equivalence class representatives. Then define

X:={A:λ1(H0A) is isomorphic to an element in X0}.X:=\left\{A: \lambda^{-1}(H_0\otimes A)\text{ is isomorphic to an element in }X_0\right\}.

Lifting conjecture. The set XX is a complete set of exact HH-equivariant Morita equivalence class representatives.

This conjecture proposes that exact equivariant Morita equivalence classes for a finite-dimensional Hopf algebra with the dual Chevalley property can be classified by lifting representatives from the coradical. It is motivated by the lifting method and computations for pointed Hopf algebras with cyclic coradical; the supplied source gives no resolution.

Sources & referencesView supporting material

Primary source

Jacob Van Grinsven, “H-Equivariant Morita equivalences of Loewy-graded comodule algebras”, arXiv:2510.09540 (2025).

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