Iff.not

∀ {a b : Prop}, (a ↔ b) → (¬a ↔ ¬b)

Alias of not_congr.

Defined in: Mathlib.Logic.Basic
Cited by: 489 results in Mathlib
Foundations: Depth 4 from the axioms, rests on 3 definitions · uses no axioms

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.

Nothing in Mathlib beyond the foundations.

Results whose statement or proof uses this declaration.

Showing the 200 most cited of 489.