Theorem reldom

Description: Dominance is a relation. (Contributed by NM, 28-Mar-1998)

	Ref	Expression
Assertion	reldom	$$⊢\mathrm{Rel}\preccurlyeq$$

Proof

Step	Hyp	Ref	Expression
1		df-dom	$$⊢\preccurlyeq =\left\{⟨x,y⟩|\exists ff:x\underset{1-1}{⟶}y\right\}$$
2	1	relopabiv	$$⊢\mathrm{Rel}\preccurlyeq$$