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Proof step 6 from proof fix-rec-pos (previous step)

bytes = by + bytes0, bytes2int(bytes) < 0, # bytes < n, 0 ≤ b2i(by) ⊦ bytes = [], fix(n, bytes) = i2b(0) ' + fix(n - 1, bytes)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 7:
bytes2int(by ' + bytes0) < 0, 0 ≤ b2i(by), 1 + # bytes0 < n ⊦ fix(n, by ' + bytes0) = i2b(0) ' + fix(n - 1, by ' + bytes0)

Rule argument

Additional information

Used simplifier rules: ⊦ i < 0 ∧ 0 ≤ j → i < j;% ⊦ i ≤ j ∧ 0 ≤ i → 0 ≤ j; (forward)% ⊦ j < i ∧ i ≤ 0 → j < 0; (forward)% ⊦ i < j ∧ j ≤ j0 → i < j0; (forward)% ⊦ # by ' = 0 +1;% ⊦ #(bytes + bytes0) = # bytes + # bytes0;% ⊦ (bytes + bytes0) + bytes1 = bytes + bytes0 + bytes1;% ⊦ by ' + bytes ≠ [];% ⊦ by + bytes = by ' + bytes;