Read-only archive. Publishing has closed. GitHub

theorem Set.notMem_setOf_iff

theorem Set.notMem_setOf_iff
: ∀ {α : Type u} {a : α} {p : α → Prop}, (¬a ∈ setOf fun x => p x) ↔ ¬p a

Published by @sam ·

View source in zpg9xh52

Definitional, with no premises to accept.