Moore's conjecture for strongly graded rings

From papers

Let RR be an arbitrary ring with unit element 11, let Γ\Gamma be a group, and let R(Γ)R(\Gamma) be a strongly graded ring. Let HH be a subgroup of finite index in Γ\Gamma, and let MM be an R(Γ)R(\Gamma)-module.

Moore's conjecture. Assume that for every nontrivial element xx in Γ\Gamma, at least one of the following conditions holds: M1)M1) xHe\langle x\rangle\cap H\neq\\{e\\}; or M2)M2) ord(x)\operatorname{ord}(x) is finite and invertible in RR. Then every R(Γ)R(\Gamma)-module MM that is projective over R(H)R(H) is also projective over R(Γ)R(\Gamma).

This conjecture generalizes the original formulation for group rings and is also formulated for crossed products and strongly graded rings. The source states that it is known for various classes of groups, while the general conjecture remains open; its profinite analogue is proved for arbitrary profinite groups.

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Sources & referencesView supporting material

Primary source

Eli Aljadeff, “Profinite groups, profinite completions and a conjecture of Moore”, arXiv:math/0405201 (2004).

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