Abstract: Using the singular value decomposition of matrix,the authors give several results on the extremum for matrix quadratic form,which corrects and generalizes some results in [1].

• 文摘:本文利用矩阵的奇异值分解，给出矩阵二次型极值的若干结果，这些结果修正并推广了文献[1]中的一些结论。