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Proof step 8 from proof fix-butlast-longer (previous step)

# bytes < n ⊦ bytes = [], # bytes = 1, fillsgn(n, bytes.butlast) = fillsgn(n, bytes).first ' + fillsgn(n, bytes).butlast

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 9:
⊦ 1 < # bytes → fillsgn(n, bytes.butlast) = fillsgn(n + 1, bytes).butlast
Proof step 10:
1 < # bytes, # bytes < n ⊦ bytes = [], # bytes = 1, fillsgn(n + 1, bytes).butlast = fillsgn(n, bytes).first ' + fillsgn(n, bytes).butlast

Rule argument

name: fillsgn-butlast rotate: F subst: [bytes, n] → [bytes, n]

Additional information

Used simplifier rules: ⊦ 1 < m ↔ ¬(m = 0 ∨ m = 1);% ⊦ # bytes = 0 ↔ bytes = []; Used terms: bytes, n