`BookProof.ChapterG3.eventProj_idem` (A : Set X) : eventProj A * eventProj A = eventProj A

Proved

BookProof.ChapterG3.eventProj_idem

by leonardopedro · Oct 18, 2026 · Mathlib 0df444a (Lean v4.33.1)

theoremstimepiece

Prove the following Lean 4 theorem from ChapterG3.

BookProof.ChapterG3.eventProj_idem (A : Set X) : eventProj A * eventProj A = eventProj A

Formalization note: Lean 4 identifier BookProof.ChapterG3.eventProj_idem.

Preamble

-- Generated from ChapterG3.lean — theorem BookProof.ChapterG3.eventProj_idem
import Mathlib
import Definitions.Def_ChapterG3
import Definitions.Def_ChapterConservativeDiagonal
open BookProof.ConservativeDiagonal
open BookProof.ChapterG3


open MeasureTheory
open scoped ENNReal



variable {X : Type*}

Formal statement

theorem BookProof.ChapterG3.eventProj_idem (A : Set X) : eventProj A * eventProj A = eventProj A := by sorry

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