theorem extracted_formal_statement_5 {n : ℕ} (σ : Signs n) (k : Fin n) : |↑(σ k)| = 1 := sorry

State before:
n : ℕ
σ : Signs n
k : Fin n
⊢ |↑(σ k)| = 1

Tactic: simp

State after:

Relevant lemmas: