Int.subgroup_index_ne_zero_iff

∀ {ι : Type u_1} [Finite ι] {H : Subgroup (ι → Multiplicative ℤ)}, H.index ≠ 0 ↔ Nonempty (↥H ≃* (ι → Multiplicative ℤ))

Defined in: Mathlib.LinearAlgebra.FreeModule.Int
Cited by: 0 results in Mathlib
Foundations: Depth 125 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes: Finite

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