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	$$⊢A=C$$