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Metamath Proof Explorer

Theorem relwdom

Description: Weak dominance is a relation. (Contributed by Stefan O'Rear, 11-Feb-2015)

Ref Expression
Assertion relwdom Rel ≼*

Proof

Step Hyp Ref Expression
1 df-wdom ⊢ ≼* = { ⟨ 𝑥 , 𝑦 ⟩ ∣ ( 𝑥 = ∅ ∨ ∃ 𝑧 𝑧 : 𝑦 –onto→ 𝑥 ) }
2 1 relopabiv ⊢ Rel ≼*