⊦ s2i(i2s(j * j0)) = s2i(i2s(s2i(i2s(j)) * j0))
⊦ s2i(i2s(s2i(i2s(j)) * j0)) = s2i(i2s(s2i(i2s(j)) * s2i(i2s(j0))))
Used terms: j0, j