Theorem eqtr3i

Description: An equality transitivity inference. (Contributed by NM, 6-May-1994)

	Ref	Expression
Hypotheses	eqtr3i.1	|- A = B
	eqtr3i.2	|- A = C
Assertion	eqtr3i	|- B = C

Proof

Step	Hyp	Ref	Expression
1		eqtr3i.1	|- A = B
2		eqtr3i.2	|- A = C
3	1	eqcomi	|- B = A
4	3 2	eqtri	|- B = C