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Proof step 15 from proof getbar-restn (previous step)

n→i(n) ≤ st[r -- _length] .intval ⊦ # restn(n, getbytearray(r, st)) = i→n(st[r -- _length] .intval - n→i(n))

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
n ≤ # bytes ⊦ # restn(n, bytes) = # bytes - n
Proof step 5:
¬ n ≤ # getbytearray(r, st), n→i(n) ≤ st[r -- _length] .intval ⊦ # restn(n, getbytearray(r, st)) = i→n(st[r -- _length] .intval - n→i(n))
Proof step 14:
n ≤ # getbytearray(r, st), n→i(n) ≤ st[r -- _length] .intval ⊦ # getbytearray(r, st) - n = i→n(st[r -- _length] .intval - n→i(n))

Rule argument

[speclemmaarg: n ≤ # bytes ,# restn(n, bytes) = # bytes - n ,[bytes, n] → [getbytearray(r, st), n] ,F ,list-del ,bytelist ,rest-len ]

Additional information

[[CONCRETESIMPRULES : ()], [EXTRATERMS : (getbytearray(r, st), n)]]