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LeanPool.Superdiffusion.Algsuperdiff.Probability.Average

Finite-measure average estimates #

Shared analytic support for bounded measurable limits and local representatives. Ported from scottnarmstrong/Superdiffusion at 7f20476385d4af418f110303085ad0740c9eba46.

theorem Algsuperdiff.Probability.abs_average_sub_const_le_of_ae {Omega : Type u_1} [MeasurableSpace Omega] {mu : MeasureTheory.Measure Omega} [MeasureTheory.IsFiniteMeasure mu] (hmu : mu ≠ 0) {f : Omega → ℝ} (hf : MeasureTheory.Integrable f mu) {c C : ℝ} (hC : ∀ᵐ (y : Omega) ∂mu, |f y - c| ≤ C) :
|⨍ (y : Omega), f y ∂mu - c| ≤ C

An almost-everywhere bound about a constant also bounds the finite-measure average.