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Proof step 4 from proof fids-put2 (previous step)

tree0[parent(str + p0)].dir?, parent(str + p0) ∈ tree0, ∀ tree0, tree1. tree0[parent(p0)].dir? ∧ parent(p0) ∈ tree0 → tree0[p0, tree1].fids = tree0.fids ∪ tree1.fids ∨ p0 = ε ∨ p0 ∈ tree0 ⊦ str + p0 = ε, tree0[str + p0, tree1].fids = tree0.fids ∪ tree1.fids, str + p0 ∈ tree0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
tree0[parent(str ' + p0)].dir?, parent(str ' + p0) ∈ tree0, ∀ tree0, tree1. tree0[parent(p0)].dir? ∧ parent(p0) ∈ tree0 → tree0[p0, tree1].fids = tree0.fids ∪ tree1.fids ∨ p0 = ε ∨ p0 ∈ tree0 ⊦ tree0[str ' + p0, tree1].fids = tree0.fids ∪ tree1.fids, str ' ∈ tree0 ∧ p0 ∈ tree0[str ']

Rule argument

Additional information

Used simplifier rules: ⊦ p + q ∈ tree ↔ p ∈ tree ∧ q ∈ tree[p]; (s)%a: ⊦ (p + p0) + p1 = p + p0 + p1; from specification list[path]% ⊦ str ' + p ≠ ε; (s)% ⊦ str + p = str ' + p; (s)