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

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 6:
path(r ' + x, H) ⊦ reachable(r, (r ' + x).last, H[r2, ce]), r2 ∈ H

Rule argument

Additional information