上三角算子矩阵值域的闭性

J4 ›› 2012, Vol. 47 ›› Issue (4): 42-46.

DU Gui-chun^1,2, SHAO Chun-fang¹

1. Department of Mathematics, Ankang University, Ankang 725000, Shaanxi, China;
2. School of Mathematics and Statistics, Wuhan University, Wuhan 430072, Hubei, China

DU Gui-chun1,2, SHAO Chun-fang1. Closedness of ranges of upper triangular operator matrix[J].J4, 2012, 47(4): 42-46.

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