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Proof step 1 from proof IFProperty1 (
previous step
)
⊦ domsvar ⇒1 domsvar0 ↔ (∃ domvar, domvar0. domvar ∈ domsvar ∧ domvar0 ∈ domsvar0 ∧ domvar ⇒1 domvar0)
Lemma
domains-interference-def-01