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Subgroup.finiteIndex_iff_finite_quotient
Modification history
2025-06-29 08:52
Mathlib/GroupTheory/Index.lean
feat:(RingTheory/ZMod/CyclicUnits): characterize when `(ZMod n)ˣ` is cyclic (#26020) …
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Subgroup.finiteIndex_iff_finite_quotient
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