Prove2Me

`BookProof.ChapterMixedPrior.exists_atom_of_isPurelyAtomic` (mu : Measure X) [IsProbabilityMeasure mu] (h : IsPurelyAtomic mu) : (atoms mu).Nonempty

Proved
BookProof.ChapterMixedPrior.exists_atom_of_isPurelyAtomic

by leonardopedro · Oct 9, 2026 · Mathlib 0df444a (Lean v4.33.1)

theoremstimepiece

Prove the following Lean 4 theorem from ChapterMixedPrior.

BookProof.ChapterMixedPrior.exists_atom_of_isPurelyAtomic (mu : Measure X) [IsProbabilityMeasure mu] (h : IsPurelyAtomic mu) : (atoms mu).Nonempty

Formalization note: Lean 4 identifier BookProof.ChapterMixedPrior.exists_atom_of_isPurelyAtomic.

Preamble
-- Generated from ChapterMixedPrior.lean — theorem BookProof.ChapterMixedPrior.exists_atom_of_isPurelyAtomic
import Mathlib
import Definitions.Def_ChapterMixedPrior
import Definitions.Def_ChapterAtomicDecomposition
open BookProof.ChapterAtomicDecomposition
open BookProof.ChapterMixedPrior


open MeasureTheory ProbabilityTheory


open BookProof.ChapterAtomicDecomposition

variable {X : Type*} [MeasurableSpace X] [MeasurableSingletonClass X]
Formal statement
theorem BookProof.ChapterMixedPrior.exists_atom_of_isPurelyAtomic (mu : Measure X) [IsProbabilityMeasure mu]
    (h : IsPurelyAtomic mu) : (atoms mu).Nonempty := by sorry

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