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Proof step 39 from proof pushx-inv-gen (previous step)

n < # x, inv(ixs, n) ⊦ x = [], inv(pushx(n, ixs, x), n + 1)

Heuristic structural induction applied rule structural induction

And obtained the following new goals

Proof step 6:
n < # x, inv([], n) ⊦ x = [], inv(pushx(n, [], x), n + 1)

Rule argument

term:ixs

Additional information

[Concretesimprules((Csimpgen(illist freely generated by [], +;)))]