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Proof step 4 from proof tr-unfold (previous step)

t = branch(t2, a0, t3), ((tr(r, t) * P))(H) ⊦ r = null, ∃ t0, t1, a, r0, r1. t = branch(t0, a, t1) ∧ ((r => mknode(r0, a, r1) * tr(r0, t0) * tr(r1, t1) * P))(H)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
((tr(r, branch(t2, a0, t3)) * P))(H) ⊦ r = null, ∃ t0, t1, a, r0, r1. branch(t2, a0, t3) = branch(t0, a, t1) ∧ ((r => mknode(r0, a, r1) * tr(r0, t0) * tr(r1, t1) * P))(H)

Proof step 4 from proof tr-unfold (previous step)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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