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Proof step 1 from proof path-trans (conclusion)

path(x, H) ∧ x.last = r ∧ path(r ' + y, H) ⊦ path(x + y, H)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
path(x, H), path(x.last ' + y, H) ⊦ path(x + y, H)

Rule argument

Additional information