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Proof step 17 from proof coversi-append (conclusion)

⊦ covers(ix0 ' + ixs, ix) ∧ ¬ covers(ixs, ix) → (∃ n. n ∈ ix0 ∧ n ∈ ix)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 16:
covers(ix0 ' + ixs, ix) ⊦ covers(ixs, ix), ∃ n. n ∈ ix0 ∧ n ∈ ix

Rule argument

Additional information

[Concretesimprules(())]