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Proof step 17 from proof getarray-in (previous step)

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

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 16:
⊦ 0 ≤ st[r -- _length] .intval → # getarray(r, st) = i→n(st[r -- _length] .intval)

Rule argument

[crewrite-arg: getarray-length, F, [st, r] → [st, r]]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ i < j → ¬ j < i], [CSIMPSEQ : ⊦ ¬ i ≤ j ↔ j < i], [CSIMPSEQ : ⊦ 0 < i → n→i(i→n(i)) = i], [CSIMPSEQ : ⊦ i < j → (¬ ¬ j ≤ i ↔ false)])], [EXTRATERMS : (st, r)]]