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Proof step 4 from proof getbar-len-01 (previous step)

st[r -- _length] .intval < 0 ⊦ getbytearray(r, st) = []

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ getbytearray(r, st) = getbytearray(r, 0, st[r -- _length] .intval, st)
Proof step 2:
⊦ getbytearray(r, i, j, st) = bytevalues(getarray(r, i, j, st))
Proof step 3:
⊦ getarray(r, i, j, st) = [] ↔ j ≤ 0

Rule argument

[crewrite-arg: getByteArray-all, F, [st, r] → [st, r]]

Additional information

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