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Proof step 4 from proof rem-reachable-rev-weak (previous step)

ce.nxt = H[H[r1].nxt].nxt, ∃ x. path(r ' + x, H[r1, ce]) ∧ (r ' + x).last = r0, H[r1].nxt ∈ H, r1 ∈ H, r0 ∈ H[r1, ce] ⊦ r1 = null, H[r1].nxt = null, r0 = H[r1].nxt, reachable(r, r0, H)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
ce.nxt = H[H[r1].nxt].nxt, path(r ' + x, H[r1, ce]), H[r1].nxt ∈ H, r1 ∈ H, (r ' + x).last ∈ H[r1, ce] ⊦ r1 = null, H[r1].nxt = null, (r ' + x).last = H[r1].nxt, reachable(r, (r ' + x).last, H)

Proof step 4 from proof rem-reachable-rev-weak (previous step)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information