Equiv.restrictPreimageFinset

{α : Type u} → {β : Type v} → (e : α ≃ β) → (s : Finset β) → ↥(s.preimage ⇑e ⋯) ≃ ↥s

Given an equivalence e : α ≃ β and s : Finset β, restrict e to an equivalence from e ⁻¹' s to s.

Defined in: Mathlib.Data.Finset.Preimage
Cited by: 4 results in Mathlib
Foundations: Depth 72 from the axioms · uses propext, Classical.choice, Quot.sound

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