`BookProof.ChapterA3j.projChirR_idem` : projChirR * projChirR = projChirR

Proved

BookProof.ChapterA3j.projChirR_idem

by leonardopedro · Oct 6, 2026 · Mathlib 0df444a (Lean v4.33.1)

theoremstimepiece

Prove the following Lean 4 theorem from ChapterA3j.

BookProof.ChapterA3j.projChirR_idem : projChirR * projChirR = projChirR

Formalization note: Lean 4 identifier BookProof.ChapterA3j.projChirR_idem.

Preamble

-- Generated from ChapterA3j.lean — theorem BookProof.ChapterA3j.projChirR_idem
import Definitions.Def_ChapterA3
import Mathlib
import Definitions.Def_ChapterA3j
open BookProof.ChapterA3j


open Matrix


open BookProof.ChapterA3

Formal statement

theorem BookProof.ChapterA3j.projChirR_idem : projChirR * projChirR = projChirR := by sorry

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