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Proof step 12 from proof fix-butlast-longer (previous step)

fillsgn(n, bytes) = by + bytes0 ∧ fillsgn(n, bytes) ≠ [], # bytes < n ⊦ bytes = [], # bytes = 1, fillsgn(n + 1, bytes).butlast = by ' + fillsgn(n, bytes).butlast

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 13:
fillsgn(n, bytes) = by ' + bytes0, # bytes < n, by ∈ fillsgn(n, bytes) ⊦ bytes = [], # bytes = 1, fillsgn(n + 1, bytes).butlast = by ' + fillsgn(n, bytes).butlast, fillsgn(n, bytes) = []

Rule argument

Additional information

Used simplifier rules: ⊦ (bytes + bytes0) + bytes1 = bytes + bytes0 + bytes1;% ⊦ by ' + bytes = bytes0 → by ∈ bytes0; (forward)% ⊦ by + bytes = by ' + bytes;