Equiv.eq_preimage_iff_image_eq

∀ {α : Type u_3} {β : Type u_4} (e : α ≃ β) (s : Set α) (t : Set β), s = ⇑e ⁻¹' t ↔ ⇑e '' s = t

Defined in: Mathlib.Logic.Equiv.Set
Cited by: 6 results in Mathlib
Foundations: Depth 17 from the axioms · uses propext, Classical.choice, Quot.sound

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