Theorem reldom

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

	Ref	Expression
Assertion	reldom	⊢ Rel ≼

Proof

Step	Hyp	Ref	Expression
1		df-dom	⊢ ≼ = { ⟨ 𝑥 , 𝑦 ⟩ ∣ ∃ 𝑓 𝑓 : 𝑥 –1-1→ 𝑦 }
2	1	relopabi	⊢ Rel ≼