`BookProof.ChapterG3.eventProj_compl` (A : Set X) : eventProj Aᶜ = 1 - eventProj A

Proved

BookProof.ChapterG3.eventProj_compl

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

theoremstimepiece

Prove the following Lean 4 theorem from ChapterG3.

BookProof.ChapterG3.eventProj_compl (A : Set X) : eventProj Aᶜ = 1 - eventProj A

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

Preamble

-- Generated from ChapterG3.lean — theorem BookProof.ChapterG3.eventProj_compl
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_compl (A : Set X) :
    eventProj Aᶜ = 1 - eventProj A := by sorry

View graph