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Proof step 186 from proof rem-stays-reachable-aux2 (previous step)

(r1 ' + x0).last = x.last, H[x.last].nxt = H[r1].nxt, path(H[H[r1].nxt].nxt ' + x3 + r1 ', H), H[r1].nxt ∈ H, x.last ∈ H, path(r ' + x, H), path(r ' + x + H[r1].nxt ' + (H[H[r1].nxt].nxt ' + x3) + r1 ', H), r1 ∈ H, path(r1 ' + x0, H) ⊦ H[r1].nxt = null, r = H[H[r1].nxt].nxt, H[r1].nxt = H[H[r1].nxt].nxt, r1 = H[H[r1].nxt].nxt, r1 = r, r = H[r1].nxt, H[r1].nxt = r1, x = [], dups(x3), dups(x), dups(x + x3), H[H[r1].nxt].nxt ∈ x, H[H[r1].nxt].nxt ∈ x3, r1 ∈ x, r1 ∈ x0, dups(x0), r ∈ x, r ∈ x3, H[r1].nxt ∈ x, H[r1].nxt ∈ x3, r1 ∈ x3

User applied rule insert elim lemma

And obtained the following new goals

Proof step 187:
x = x1 + r0 ', (r1 ' + x0).last = r0, H[r0].nxt = H[r1].nxt, path(H[H[r1].nxt].nxt ' + x3 + r1 ', H), H[r1].nxt ∈ H, r0 ∈ H, path(r ' + x, H), path(r ' + x + H[r1].nxt ' + (H[H[r1].nxt].nxt ' + x3) + r1 ', H), r1 ∈ H, path(r1 ' + x0, H) ⊦ H[r1].nxt = null, r = H[H[r1].nxt].nxt, H[r1].nxt = H[H[r1].nxt].nxt, r1 = H[H[r1].nxt].nxt, r1 = r, r = H[r1].nxt, H[r1].nxt = r1, x = [], dups(x3), dups(x), dups(x + x3), H[H[r1].nxt].nxt ∈ x, H[H[r1].nxt].nxt ∈ x3, r1 ∈ x, r1 ∈ x0, dups(x0), r ∈ x, r ∈ x3, H[r1].nxt ∈ x, H[r1].nxt ∈ x3, r1 ∈ x3

Rule argument

spec: list-last inst: reflist name: last-elim seq: x0 ≠ [] ⊦ r = x0.last ∧ x1 = x0.butlast ↔ x0 = x1 + r ' subst: [x0, r, x1] → [x, r0, x1] flags: []

Additional information

Used simplifier rules: x0 ≠ [] ⊦ r = x0.last ∧ x1 = x0.butlast ↔ x0 = x1 + r '; (elim) Used terms: x, r0, x1