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Proof step 13 from proof fix-butlast (previous step)

# bytes < n + 1 ⊦ fix(n, bytes.butlast) = fillsgn(n + 1, bytes).butlast, n = 0, # bytes = 1, bytes = []

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 14:
# bytes ≤ n ⊦ fix(n, bytes.butlast) = fillsgn(n + 1, bytes).butlast, n = 0, # bytes = 1, bytes = []

Rule argument

Additional information

Used simplifier rules: ⊦ m + n = n + m;% ⊦ (m + n0) + n1 = m + n0 + n1;% ⊦ ¬ m < n ↔ n ≤ m;% ⊦ m < n + 1 ↔ ¬ n < m;