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`BookProof.ChapterParityZ4.combinedParity_sq_ne_one` : combinedParity ^ 2 ≠ 1

Proved
BookProof.ChapterParityZ4.combinedParity_sq_ne_one

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

theoremstimepiece

Prove the following Lean 4 theorem from ChapterParityZ4.

BookProof.ChapterParityZ4.combinedParity_sq_ne_one : combinedParity ^ 2 ≠ 1

Formalization note: Lean 4 identifier BookProof.ChapterParityZ4.combinedParity_sq_ne_one.

Preamble
-- Generated from ChapterParityZ4.lean — theorem BookProof.ChapterParityZ4.combinedParity_sq_ne_one
import Definitions.Def_ChapterParity
import Definitions.Def_ChapterParityQL
import Definitions.Def_ChapterA3
import Mathlib
import Definitions.Def_ChapterParityZ4
open BookProof.ChapterParityZ4


open Matrix


open BookProof.ChapterParity
open BookProof.ChapterParityQL
open BookProof.ChapterA3
Formal statement
theorem BookProof.ChapterParityZ4.combinedParity_sq_ne_one : combinedParity ^ 2 ≠ 1 := by sorry

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