| ¬(~32768 ≤ b2i(by1) + b2i(by2) ∧ b2i(by1) + b2i(by2) < 32768) ⊦ b2i(by1) + b2i(by2) = s2i(i2s(b2i(by1) + b2i(by2))) |
⊦ b2i(by1) + b2i(by2) = s2i(i2s(b2i(by1) + b2i(by2))), ¬ b2i(by1) + b2i(by2) < ~32768 ∧ ¬ 32768 ≤ b2i(by1) + b2i(by2)
Used simplifier rules: ⊦ ¬ i < j ↔ j ≤ i;% ⊦ i + j = j + i;% ⊦ i + j + i0 = (i + j) + i0;% ⊦ ¬ i ≤ j ↔ j < i;