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Proof step 49 from proof rem-stays-reachable-aux2 (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 50:
H[r].nxt = H[H[r].nxt].nxt, H[r].nxt ∈ H, path(H[r].nxt ' + x + r ', H), r ∈ H ⊦ r = null, H[r].nxt = null, H[r].nxt = r, H[r].nxt ∈ x, r ∈ x, dups(x)

Rule argument

Additional information

Used simplifier rules: f: ⊦ dups(x0 + r ') ↔ r ∈ x0 ∨ dups(x0); from specification list-dup[reflist]%in-17: ⊦ r ∈ r0 ' ↔ r = r0; from specification list[reflist]%in-append: ⊦ r ∈ x0 + x1 ↔ ¬ ¬(r ∈ x0 ∨ r ∈ x1); from specification list[reflist]%a: ⊦ (x0 + x1) + x2 = x0 + x1 + x2; from specification list[reflist]%e-02: ⊦ x0 + r ' ≠ []; from specification list[reflist]