Theorem eqtr2i

Description: An equality transitivity inference. (Contributed by NM, 21-Feb-1995)

	Ref	Expression
Hypotheses	eqtr2i.1	$$⊢A=B$$
	eqtr2i.2	$$⊢B=C$$
Assertion	eqtr2i	$$⊢C=A$$

Proof

Step	Hyp	Ref	Expression
1		eqtr2i.1	$$⊢A=B$$
2		eqtr2i.2	$$⊢B=C$$
3	1 2	eqtri	$$⊢A=C$$
4	3	eqcomi	$$⊢C=A$$