证明:由特勒根定理: ∑ unik=0和 ∑ k=1 即:∑lkik=l1i+u2i2+∑ukik k=3 =l1in+u2i2+∑ R,,ik=0 ∑ +∑ uk k ui1+u2 l k=<i 1i1+u2i2+∑ Ri, ik=0 k=3 入 两式相减,得 11+L2l2=1l1+W2l证明: 由特勒根定理： 0 ˆ 0 1 1  =  = = =  b k k k b k k k u i 和 u i 0 3 2 2 1 1 3 2 2 1 1 1 = + +  =  = + +  =    =    =  b k k k k b k k k b k k k u i u i R i i 即： u i u i u i u i 0 3 2 2 1 1 3 2 2 1 1 1 = + +  =  = + +  =    =    =  b k k k k b k k k b k k k u i u i R i i u i u i u i u i 两式相减，得 ˆ ˆ 2 2 1 1 1 1 2 2 u i u i u i u i   + = +