Theorem ensymd

Description: Symmetry of equinumerosity. Deduction form of ensym . (Contributed by David Moews, 1-May-2017)

	Ref	Expression
Hypothesis	ensymd.1	$$⊢\phi \to A\approx B$$
Assertion	ensymd	$$⊢\phi \to B\approx A$$

Proof

Step	Hyp	Ref	Expression
1		ensymd.1	$$⊢\phi \to A\approx B$$
2		ensym	$$⊢A\approx B\to B\approx A$$
3	1 2	syl	$$⊢\phi \to B\approx A$$