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Proof step 23 from proof getarray-in (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
⊦ n < # getarray(r, st) → (getarray(r, st)[n]) = st[r -- n→i(n) ']
Proof step 22:
⊦ (∃ n. n < # getarray(r, st) ∧ st[r -- n→i(n) '] = val) ↔ (∃ i. ¬ i < 0 ∧ ¬ st[r -- _length] .intval ≤ i ∧ st[r -- i '] = val)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]