题目7单选题
设 σ 是数域P上n维线性空间V上的线性变换,下列说法错误的是A. 设σ在某组基下的矩阵是<img src="https://tihai-oss-cloud.itihey.com/img/152b35092201fc3a9190bff9ff1f9819.png">,且<img src="https://tihai-oss-cloud.itihey.com/img/af3c58ee737e716089cbfc1fa238f031.png">是<img src="https://tihai-oss-cloud.itihey.com/img/61f515f42030a60730d09ca23ab00c03.png">的特征值,则线性方程组<img src="https://tihai-oss-cloud.itihey.com/img/8ddea108ed9d58326365bdda0d2ca3f0.png">的解空间就是不变子空间<img src="https://tihai-oss-cloud.itihey.com/img/fe240e9efdda30f3f855162ee7e1c45d.png">B. 在σ在某组基下的矩阵是<img src="https://tihai-oss-cloud.itihey.com/img/152b35092201fc3a9190bff9ff1f9819.png">,若线性方程组<img src="https://tihai-oss-cloud.itihey.com/img/7d2d2780e141e897f6b37313a7cc60bc.png">有非零解,则 <img src="https://tihai-oss-cloud.itihey.com/img/7f22ee000dbad73ab3d437c1fedc36ca.png">是σ的特征值C. 若<img src="https://tihai-oss-cloud.itihey.com/img/bb1e7a5215cec84730236e22267d34b8.png">是<img src="https://tihai-oss-cloud.itihey.com/img/61f515f42030a60730d09ca23ab00c03.png">的特征值,则特征子空间<img src="https://tihai-oss-cloud.itihey.com/img/fe240e9efdda30f3f855162ee7e1c45d.png">必定不是零空间D. 若V的所有特征子空间的和等于V,则必定存在V的一组基使得 σ 在这组基下的矩阵是对角矩阵