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Proof step 3 from proof no-progress-fw (previous step)

⊦ P-restr(pm, P, I, R) ↔ (∀ s, s0. I(pm, s) ∧ I(pm, s0) ∧ P(pm, s) ∧ R(pm, s, s0) → P(pm, s0))

Lemma P-restr-def