The alternative-Hopf-structure conjecture for monomial modules

Let G=Z/2rZ×Z/2sZG=\mathbb{Z}/2^r\mathbb{Z}\times\mathbb{Z}/2^s\mathbb{Z}, and let kα(r,s)\Bbbk\alpha(r,s) be the Hopf algebra with the alternative comultiplication used to define the tensor product and dual. Let \otimes and ()(-)^* denote these operations, and let \otimes' and ()(-)^\vee denote the operations defined using the standard Hopf algebra structure on kG\Bbbk G. For an odd-dimensional indecomposable monomial representation VV, the alternative-Hopf-structure conjecture. There are isomorphisms of GG-representations

VVVV,VnVn.V\otimes V^*\cong V\otimes' V^\vee,\qquad V^{\otimes n}\cong V^{\otimes' n}.

The claim is based on computational evidence for the monomial representations studied in the paper and remains conjectural.

Sources & referencesView supporting material

Primary source

George Cao and Kent B. Vashaw, “On the decomposition of tensor products of monomial modules for finite 2-groups”, arXiv:2301.04274 (2023).

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