Finset.ext

∀ {α : Type u_1} {s₁ s₂ : Finset α}, (∀ (a : α), a ∈ s₁ ↔ a ∈ s₂) → s₁ = s₂

Defined in: Mathlib.Data.Finset.Defs
Cited by: 565 results in Mathlib
Foundations: Depth 54 from the axioms, rests on 806 definitions · uses propext, Classical.choice, Quot.sound

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