Equiv.Perm.signAux

{n : ℕ} → Equiv.Perm (Fin n) → ℤˣ

signAux σ is the sign of a permutation on Fin n, defined as the parity of the number of pairs (x₁, x₂) such that x₂ < x₁ but σ x₁ ≤ σ x₂

Defined in: Mathlib.GroupTheory.Perm.Sign
Cited by: 8 results in Mathlib
Foundations: Depth 64 from the axioms · uses propext, Classical.choice, Quot.sound

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