non trivial solution

solution ... non-rusting solution 防锈剂 non-trivial solution 非无效解 null solution 零解 ...

有非零解(non-trivial solution) , 系数形成行列式为0, so| 2 λ 1 || λ-1 -1 2 | = 0| 4 1 4 |列化简 R2*(-2) R3, R1*(-2) R2得| 2 ...