English
If f is AEMeasurable with respect to m.join, then almost everywhere in m there is AEMeasurable f μ.
Русский
Если f AEMeasurable относительно m.join, то почти наверняка в m существует AEMeasurable f(μ).
LaTeX
$$AEMeasurable.ae_of_join: (h : AEMeasurable f m.join) ⇒ ∀ᵐ μ ∂m, AEMeasurable f μ$$
Lean4
theorem _root_.AEMeasurable.ae_of_join {m : Measure (Measure α)} {f : α → β} (h : AEMeasurable f m.join) :
∀ᵐ μ ∂m, AEMeasurable f μ :=
let ⟨g, hgm, hg⟩ := h;
(ae_ae_of_ae_join hg).mono fun _μ hμ ↦ ⟨g, hgm, hμ⟩