[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 152 from proof rem-stays-reachable-aux2 (previous step)

(r0 ' + x0).last = x.last, (r ' + x1).last = x.last, path(r0 ' + x0, H), path(r ' + x1 + r2 ' + x + H[r0].nxt ', H), path(r ' + x1 + r2 ' + (x + H[r0].nxt ') + r0 ', H), path(r ' + x1, H), H[r0].nxt ∈ H, r0 ∈ H, x.last ∈ H ⊦ H[r0].nxt = null, r = r2, r = H[r0].nxt, r0 = r, r0 = H[r0].nxt, r2 = r0, r2 = H[r0].nxt, x = [], dups(x0), dups(x1 + x), dups(x1), dups(x), r0 ∈ x0, r ∈ x1, r ∈ x, r0 ∈ x1, r2 ∈ x, r2 ∈ x1, r0 ∈ x, H[r0].nxt ∈ x, H[r0].nxt ∈ x1

User applied rule insert elim lemma

And obtained the following new goals

Proof step 153:
(r ' + x1).last = r1, (r0 ' + x0).last = r1, x = x2 + r1 ', path(r ' + x1, H), path(r ' + x1 + r2 ' + (x + H[r0].nxt ') + r0 ', H), path(r ' + x1 + r2 ' + x + H[r0].nxt ', H), path(r0 ' + x0, H), r1 ∈ H, r0 ∈ H, H[r0].nxt ∈ H ⊦ H[r0].nxt = null, r = H[r0].nxt, r = r2, r0 = H[r0].nxt, r0 = r, r2 = H[r0].nxt, r2 = r0, x = [], dups(x), dups(x1), dups(x1 + x), dups(x0), H[r0].nxt ∈ x1, H[r0].nxt ∈ x, r0 ∈ x, r2 ∈ x1, r2 ∈ x, r0 ∈ x1, r ∈ x, r ∈ x1, r0 ∈ x0

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, r1, x2]

Additional information

Used simplifier rules: x0 ≠ [] ⊦ r = x0.last ∧ x1 = x0.butlast ↔ x0 = x1 + r '; (elim) Used terms: x, r1, x2