[Imprint][Data Privacy Statement][E-Mail]

View long theorem info. View the proof. Back to main index. View the specification. View theorem base summary, View theorem base listing, the used properties by spec, the dependency list, the symbol table,

Proof step 16 from proof at-del (previous step)

p0 = ε, q1 ∈ (dnode(md, sdt) -- (str ' + p0))[str0 '], str0 ' ∈ dnode(md, sdt) -- (str ' + p0), p0 ∈ sdt[str], str ∈ sdt, ∀ tree0, q0. p0 ∈ tree0 ∧ ¬ p0 ⊑ q0 ∧ q0 ∈ tree0 → (tree0 -- p0)[q0] = (q0 ⊑ p0 ⊃ tree0[q0] -- restn(# q0, p0);tree0[q0]) ∨ p0 = ε ⊦ (dnode(md, sdt) -- (str ' + p0))[str0 '][q1] = (str0 ' + q1 ⊑ str ' + p0 ⊃ dnode(md, sdt)[str0 ' + q1] -- restn(# q1, p0);dnode(md, sdt)[str0 ' + q1])

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 17:
⊦ dnode(md, sdt) -- str ' = dnode(md, sdt -- str)
Proof step 18:
⊦ ε ∈ tree
Proof step 19:
⊦ str ' ∈ dnode(md, sdt) ↔ str ∈ sdt
Proof step 20:
str ∈ sdt ⊦ dnode(md, sdt)[str '] = sdt[str]
Proof step 21:
⊦ str ∈ sdt → dnode(md, sdt)[str ' + p] = sdt[str][p]
Proof step 22:
str ∈ sdt, str0 ∈ sdt, q1 ∈ sdt[str0] ⊦ sdt[str0][q1] = (str0 ' + q1 = str ' ⊃ sdt[str0][q1] -- restn(# q1, ε);sdt[str0][q1]), str0 = str

Rule argument

Additional information

Used simplifier rules: del-here: ⊦ dnode(md, sdt) -- str ' = dnode(md, sdt -- str);%nil-in: ⊦ ε ∈ tree;%one-ind: ⊦ str ' ∈ dnode(md, sdt) ↔ str ∈ sdt;%one-at: str ∈ sdt ⊦ dnode(md, sdt)[str '] = sdt[str];%at-dnode: ⊦ str ∈ sdt → dnode(md, sdt)[str ' + p] = sdt[str][p];% ⊦ ε ⊑ p; (s)% ⊦ str ≠ str0 → (sdt -- str0)[str] = sdt[str]; (s)% ⊦ str ' + p ≠ ε; (s)% ⊦ p ⊑ str ' ↔ p = ε ∨ p = str '; (s)%str ≠ str0 ⊦ (sdt -- str0)[str] = sdt[str]; (s)% ⊦ str ∈ sdt -- str0 ↔ str ≠ str0 ∧ str ∈ sdt; (s)%a: ⊦ (p + p0) + p1 = p + p0 + p1; from specification list[path]% ⊦ p + ε = p; (s)