Theorem syl5reqr

Description: An equality transitivity deduction. (Contributed by NM, 29-Mar-1998)

	Ref	Expression
Hypotheses	syl5reqr.1	|- B = A
	syl5reqr.2	|- ( ph -> B = C )
Assertion	syl5reqr	|- ( ph -> C = A )

Proof

Step	Hyp	Ref	Expression
1		syl5reqr.1	|- B = A
2		syl5reqr.2	|- ( ph -> B = C )
3	1	eqcomi	|- A = B
4	3 2	syl5req	|- ( ph -> C = A )