isPiSystem_piiUnionInter

∀ {α : Type u_3} {ι : Type u_4} (π : ι → Set (Set α)),
  (∀ (x : ι), IsPiSystem (π x)) → ∀ (S : Set ι), IsPiSystem (piiUnionInter π S)

If π is a family of π-systems, then piiUnionInter π S is a π-system.

Defined in: Mathlib.MeasureTheory.PiSystem
Cited by: 3 results in Mathlib
Foundations: Depth 61 from the axioms · uses propext, Classical.choice, Quot.sound

Around this declaration

Dashed lines are statement dependencies; solid lines are citations in proofs.

Mathlib declarations this one mentions in its statement or cites explicitly in its proof. Plumbing is filtered out.

Results whose statement or proof uses this declaration.