Theorem eqtr4i

Description: An equality transitivity inference. (Contributed by NM, 26-May-1993)

	Ref	Expression
Hypotheses	eqtr4i.1	|- A = B
	eqtr4i.2	|- C = B
Assertion	eqtr4i	|- A = C

Proof

Step	Hyp	Ref	Expression
1		eqtr4i.1	|- A = B
2		eqtr4i.2	|- C = B
3	2	eqcomi	|- B = C
4	1 3	eqtri	|- A = C