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Proof step 7 from proof getarray-in (previous step)

¬ 0 ≤ st[r -- _length] .intval, n < # getarray(r, st) ⊦ getarray(r, st) = [], ∃ i. ¬ i < 0 ∧ ¬ st[r -- _length] .intval ≤ i ∧ st[r -- i '] = st[r -- n→i(n) ']

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 6:
n < # getarray(r, st), st[r -- _length] .intval < 0 ⊦ getarray(r, st) = [], ∃ i. ¬ i < 0 ∧ ¬ st[r -- _length] .intval ≤ i ∧ st[r -- i '] = st[r -- n→i(n) ']

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPFORWARD : ⊦ j < i ∧ i ≤ 0 → j < 0], [CSIMPSEQ : ⊦ ¬ i ≤ j ↔ j < i])]]