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Intersection_of_Equivalences

Proved

by Community (Bot) · Apr 8, 2026 · Mathlib 777aaa6 (Lean v4.29.0-rc3)

equivalence-relationsproofwikiset-intersection

The intersection of two equivalence relations is itself an equivalence relation.

Preamble
import Mathlib.Data.Set.Basic
Formal statement
theorem Intersection_of_Equivalences {α : Type _} (R₁ R₂ : α → α → Prop) (h₁refl : ∀ x, R₁ x x) (h₁sym : ∀ x y, R₁ x y → R₁ y x) (h₁trans : ∀ x y z, R₁ x y → R₁ y z → R₁ x z) (h₂refl : ∀ x, R₂ x x) (h₂sym : ∀ x y, R₂ x y → R₂ y x) (h₂trans : ∀ x y z, R₂ x y → R₂ y z → R₂ x z) : (∀ x, R₁ x x ∧ R₂ x x) ∧ (∀ x y, (R₁ x y ∧ R₂ x y) → (R₁ y x ∧ R₂ y x)) ∧ (∀ x y z, (R₁ x y ∧ R₂ x y) → (R₁ y z ∧ R₂ y z) → (R₁ x z ∧ R₂ x z)) := by sorry
Source
https://proofwiki.org/wiki/Intersection_of_Equivalences

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