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Proof step 9 from proof setShort-theorem-01 (previous step)

fillsgn(2, int2bytes(s2i(sho))) = by ' + bytes, # bytes = 1 ⊦ by ' + bytes = i2b(s2i(sho) i>> 8) ' + i2b(s2i(sho)) ', bytes = []

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 10:
⊦ # bytes = 1 ↔ bytes = bytes.first + []
Proof step 11:
fillsgn(2, int2bytes(s2i(sho))) = by ' + bytes, bytes = bytes.first + [] ⊦ by ' + bytes = i2b(s2i(sho) i>> 8) ' + i2b(s2i(sho)) ', bytes = []

Rule argument

spec: list-data inst: bytelist name: lf-01 seq: ⊦ # bytes = 1 ↔ bytes = bytes.first + [] subst: [bytes] → [bytes] flags: rewrite

Additional information

Used terms: bytes