| 0 < i ⊦ ¬ (mklist(false, i→n(i)) + bits).first, sgn(true ' + mklist(false, i→n(i)) + bits) = true ' + mklist(false, i→n(i)) + bits |
0 < i, (mklist(false, i→n(i)) + bits).first ⊦ sgn(true ' + mklist(false, i→n(i)) + bits) = true ' + mklist(false, i→n(i)) + bits