The alternative-Hopf-structure conjecture for monomial modules

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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

V⊗V∗≅V⊗′V∨,V⊗n≅V⊗′n.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.

References

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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