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Proof step 37 from proof pushx-covers (conclusion)

⊦ covers(ixs, n) ∧ n < # x → (¬ covers(pushx(n, ixs, x), n + 1) ↔ false)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 36:
n < # x, covers(ixs, n) ⊦ x = [], covers(pushx(n, ixs, x), n + 1)

Rule argument

Additional information

[Concretesimprules((Csimpnamedseq(list-data,,l, ⊦ # x = 0 ↔ x = []) Csimpnamedforward(nat-basic1,,f, ⊦ m < n → n ≠ 0)))]