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

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 6:
path(r ' + x, H) ⊦ reachable(r, r1, H), reachable(r, (r ' + x).last, H[r1, ce])

Rule argument

Additional information