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Proof step 7 from proof prepost-get-peb (
previous step
)
⊦ ⟪ubi_wl_get_free_min#(wlar; n; boolvar)⟫ ((boolvar → n = free-ecs(wlar).min) ∧ (¬ boolvar ↔ free-ecs(wlar) = ∅))
Lemma
prepost-wl-get-free-min