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Proof step 57 from proof add-preserves-reachable-rev (previous step)

H[r1].nxt = H[ce.nxt].nxt, r1 ∈ H, (H[r1].nxt ' + x).last ∈ H[r1, ce], path(H[r1].nxt ' + x, H[r1, ce]), ce.nxt ∈ H ⊦ (H[r1].nxt ' + x).last = ce.nxt, r1 = null, ce.nxt = null, ce.nxt = r1, reachable(r1, ce.nxt, H), H[r1].nxt ∈ H ∧ H[r1].nxt ≠ null

User applied rule constructor cut

And closed the goal!

Rule argument

var: x

Additional information

Used simplifier rules: path-one: ⊦ path(r ', H) ↔ ¬ ¬(r ∈ H ∧ r ≠ null);%path-cons: ⊦ path(r ' + r0 ' + x, H) ↔ ¬ ¬(r ∈ H ∧ r ≠ null ∧ H[r].nxt = r0 ∧ path(r0 ' + x, H));%reflist freely generated by [], +;;%c: ⊦ r + x0 = r ' + x0; from specification list[reflist]%a: ⊦ (x0 + x1) + x2 = x0 + x1 + x2; from specification list[reflist]%l-05: ⊦ (r ' + r0 ' + x0).last = (r0 ' + x0).last; from specification list-last[reflist]%In-insert: ⊦ r ∈ H[r0, ce] ↔ r = r0 ∨ r ∈ H; from specification store[linheap]%k-At-same: ⊦ r = r0 → H[r0, ce][r] = ce; from specification store[linheap]%app: ⊦ x0 + [] = x0; from specification list[reflist]%l: ⊦ r '.last = r; from specification list-last[reflist]