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Proof step 6 from proof in-mod (previous step)

dnode(md, sdt0)[str + p0] = dnode(md0, sdt), str + p0 ∈ dnode(md, sdt0), ∀ md, sdt0, md0, sdt, q, md1. dnode(md, sdt0)[p0] = dnode(md0, sdt) ∧ p0 ∈ dnode(md, sdt0) → (q ∈ dnode(md, sdt0)[p0, dnode(md1, sdt)] ↔ q ∈ dnode(md, sdt0)) ∨ p0 = ε ⊦ str + p0 = ε, q ∈ dnode(md, sdt0)[str + p0, dnode(md1, sdt)] ↔ q ∈ dnode(md, sdt0)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 7:
⊦ str ' + p ∈ dnode(md, sdt) ↔ str ∈ sdt ∧ p ∈ sdt[str]
Proof step 8:
⊦ str ∈ sdt → dnode(md, sdt)[str ' + p] = sdt[str][p]
Proof step 9:
sdt0[str][p0] = dnode(md0, sdt), str ∈ sdt0, p0 ∈ sdt0[str], ∀ md, sdt0, md0, sdt, q, md1. dnode(md, sdt0)[p0] = dnode(md0, sdt) ∧ p0 ∈ dnode(md, sdt0) → (q ∈ dnode(md, sdt0)[p0, dnode(md1, sdt)] ↔ q ∈ dnode(md, sdt0)) ∨ p0 = ε ⊦ q ∈ dnode(md, sdt0)[str ' + p0, dnode(md1, sdt)] ↔ q ∈ dnode(md, sdt0)

Rule argument

Additional information

Used simplifier rules: in-dnode: ⊦ str ' + p ∈ dnode(md, sdt) ↔ str ∈ sdt ∧ p ∈ sdt[str];%at-dnode: ⊦ str ∈ sdt → dnode(md, sdt)[str ' + p] = sdt[str][p];%a: ⊦ (p + p0) + p1 = p + p0 + p1; from specification list[path]% ⊦ str ' + p ≠ ε; (s)% ⊦ str + p = str ' + p; (s)