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Proof step 17 from proof acyclic-rem-not-reachable (previous step)

ce.nxt = H[H[r0].nxt].nxt, path(r ' + (x0 + r0 ' + x) + H[r0].nxt ', H[r0, ce]), reachable(r, r0, H), r0 ∈ H, H[r0].nxt ∈ H, ∀ r1. ¬ reachable(H[r1].nxt, r1, H) ⊦ H[r0].nxt = null, H[r0].nxt = r0, r = H[r0].nxt, r = r0, dups(x0 + x), dups(x0), dups(x), r0 ∈ x, H[r0].nxt ∈ x0, H[r0].nxt ∈ x, r ∈ x0, r ∈ x, r0 ∈ x0

User applied rule cut formula

And obtained the following new goals

Proof step 18:
ce.nxt = H[H[r0].nxt].nxt, path(r ' + (x0 + r0 ' + x) + H[r0].nxt ', H[r0, ce]), path(r0 ' + x + H[r0].nxt ', H[r0, ce]), reachable(r, r0, H), H[r0].nxt ∈ H, r0 ∈ H, ∀ r1. ¬ reachable(H[r1].nxt, r1, H) ⊦ H[r0].nxt = r0, H[r0].nxt = null, r = r0, r = H[r0].nxt, dups(x), dups(x0), dups(x0 + x), r0 ∈ x0, r ∈ x, r ∈ x0, H[r0].nxt ∈ x, H[r0].nxt ∈ x0, r0 ∈ x

Rule argument

fma: path(r0 ' + x + H[r0].nxt ', H[r0, ce])

Additional information

Used simplifier rules: path-postfix: ⊦ path(x + r ' + y, H) → (path(r ' + y, H) ↔ true);%a: ⊦ (x0 + x1) + x2 = x0 + x1 + x2; from specification list[reflist] Used formulas: path(r0 ' + x + H[r0].nxt ', H[r0, ce])