cap (n - k) c6 dude bang each gach the clang thu thu j 1 , , jk caa ma trail A. Ta c6 kgt qua:detA = ZED'Si k+31+A.ik
va cac cotikdo j1.-- jk la k cot cgdinh. Tgng &toe lgy theo tat ca cac bQ ik)sao choCong thdc troll dude goi la c8ngthdc khai trim
dinh thae theo k cot ji, 'alo[r]