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Proof step 22 from proof getarray-in (previous step)

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

User applied rule case distinction

And obtained the following new goals

Rule argument

[CASEDARG : pos: right 1, ()]

Additional information

[[CONCRETESIMPRULES : ()]]