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Theorem tr-unfold

⊦ r ≠ null → (¬ ¬ (tr(r, t) * P)(H) ↔ (∃ t0, t1, a, r0, r1. t = branch(t0, a, t1) ∧ (r => mknode(r0, a, r1) * tr(r0, t0) * tr(r1, t1) * P)(H)))

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