Theorem isPiSystem_isOpen

Modification history

2023-12-20 10:04
Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean
chore: tidy various files (#9016)
Modified isPiSystem_isOpenView on Github →
2023-05-21 12:07
Mathlib/MeasureTheory/Constructions/BorelSpace/Basic.lean
feat: port MeasureTheory.Constructions.BorelSpace.Basic (#4018)
Added isPiSystem_isOpenView on Github →