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Proof step 5 from proof reachable-modbehind (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information