~32768 ≤ i, i ≤ 32767 ⊦ s2i(i2s((* i))) = i
¬(~32768 ≤ us2i(sho) ∧ us2i(sho) ≤ 32767) ⊦ s2i(i2s(us2i(sho))) = s2i(sho)
~32768 ≤ us2i(sho) ∧ us2i(sho) ≤ 32767 ⊦ us2i(sho) = s2i(sho)
Used terms: us2i(sho)