Theorem eqcomi

Description: Inference from commutative law for class equality. (Contributed by NM, 26-May-1993)

	Ref	Expression
Hypothesis	eqcomi.1	$$⊢A=B$$
Assertion	eqcomi	$$⊢B=A$$

Proof

Step	Hyp	Ref	Expression
1		eqcomi.1	$$⊢A=B$$
2		eqcom	$$⊢A=B\leftrightarrow B=A$$
3	1 2	mpbi	$$⊢B=A$$