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Proof step 4 from proof reachable-addnew (previous step)

∃ x. path(r ' + x, H) ∧ (r ' + x).last = r1, r1 ∈ H ⊦ r2 ∈ H, reachable(r, r1, H[r2, ce])

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 5:
path(r ' + x, H), (r ' + x).last ∈ H ⊦ r2 ∈ H, reachable(r, (r ' + x).last, H[r2, ce])

Rule argument

Additional information