Theorem eqbrtrri

Description: Substitution of equal classes into a binary relation. (Contributed by NM, 1-Aug-1999)

	Ref	Expression
Hypotheses	eqbrtrr.1	|- A = B
	eqbrtrr.2	|- A R C
Assertion	eqbrtrri	|- B R C

Proof

Step	Hyp	Ref	Expression
1		eqbrtrr.1	|- A = B
2		eqbrtrr.2	|- A R C
3	1	eqcomi	|- B = A
4	3 2	eqbrtri	|- B R C