| ¬(band(s2i(sho1), bcompl(s2i(sho2))) ∈short ∧ band(bcompl(s2i(sho1)), s2i(sho2)) ∈short) ⊦ bor(band(s2i(sho1), bcompl(s2i(sho2))), band(bcompl(s2i(sho1)), s2i(sho2))) = s2i(i2s(bor(band(s2i(sho1), bcompl(s2i(sho2))), band(bcompl(s2i(sho1)), s2i(sho2))))) |
⊦ bor(band(s2i(sho1), bcompl(s2i(sho2))), band(bcompl(s2i(sho1)), s2i(sho2))) = s2i(i2s(bor(band(s2i(sho1), bcompl(s2i(sho2))), band(bcompl(s2i(sho1)), s2i(sho2))))), band(s2i(sho1), bcompl(s2i(sho2))) ∈short ∧ band(bcompl(s2i(sho1)), s2i(sho2)) ∈short