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Proof step 2 from proof isarray-length-06 (conclusion)

⊦ is_array(st[r -- sks] .refval, st) ∧ sks ≠ [] → ¬ st[r -- (sks + _length ')] .intval < 0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 1:
⊦ st[r -- (sks + _length ')] .intval < 0 ∧ sks ≠ [] → ¬ is_array(st[r -- sks] .refval, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ (sks + sks0) + sks1 = sks + sks0 + sks1])]]