Theorem eqvrel1cossinidres

Description: The cosets by an intersection with a restricted identity relation are in equivalence relation. (Contributed by Peter Mazsa, 31-Dec-2021)

	Ref	Expression
Assertion	eqvrel1cossinidres	⊢ EqvRel ≀ ( 𝑅 ∩ ( I ↾ 𝐴 ) )

Proof

Step	Hyp	Ref	Expression
1		disjALTVinidres	⊢ Disj ( 𝑅 ∩ ( I ↾ 𝐴 ) )
2	1	disjimi	⊢ EqvRel ≀ ( 𝑅 ∩ ( I ↾ 𝐴 ) )