Moore's conjecture for strongly graded rings
Moore's conjecture for strongly graded rings
Let be an arbitrary ring with unit element , let be a group, and let be a strongly graded ring. Let be a subgroup of finite index in , and let be an -module.
Moore's conjecture. Assume that for every nontrivial element in , at least one of the following conditions holds: ; or is finite and invertible in . Then every -module that is projective over is also projective over .
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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