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Proof step 4 from proof hesselink-cons (previous step)

q ∈ root, p ⊑ q, ∀ q0, root, p. # q0 < # q → q0 ∈ root ∧ p ⊑ q0 → p = q0 ∨ p ∈ root ∧ root[p].dir? ⊦ p = q, p ∈ root ∧ root[p].dir?

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information