`BookProof.SmCar.jwSign_mul_self` (i : Fin n) (S : Finset (Fin n)) : jwSign i S * jwSign i S = 1

Proved

BookProof.SmCar.jwSign_mul_self

by leonardopedro · Oct 10, 2026 · Mathlib 0df444a (Lean v4.33.1)

theoremstimepiece

Prove the following Lean 4 theorem from ChapterSmCarAlgebra.

BookProof.SmCar.jwSign_mul_self (i : Fin n) (S : Finset (Fin n)) : jwSign i S * jwSign i S = 1

Formalization note: Lean 4 identifier BookProof.SmCar.jwSign_mul_self.

Preamble

-- Generated from ChapterSmCarAlgebra.lean — theorem BookProof.SmCar.jwSign_mul_self
import Mathlib
import Definitions.Def_ChapterSmCarAlgebra
open BookProof.SmCar



open Finset

variable {n : ℕ}

Formal statement

theorem BookProof.SmCar.jwSign_mul_self (i : Fin n) (S : Finset (Fin n)) : jwSign i S * jwSign i S = 1 := by sorry

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