一类反三角块阵的群逆
2020-11-11生玉秋
生玉秋
一类反三角块阵的群逆
生玉秋
(琼台师范学院 数理系,海南 海口 571127)
研究环上一类二阶反三角块阵的群逆问题.利用矩阵群逆的性质和环上矩阵运算技巧,得到了一类二阶反三角块阵群逆存在的充要条件,给出了具体的群逆表达式,并给出了应用实例.
群逆;反三角块阵;环
1 引言及预备知识
引理2来源于文献[10]的引理2.4,其中(3)~(4)原文献中没有,但由(1)~(2)易推出.
类似可证,条件(2)等价于条件(3). 证毕.
2 主要结果及证明
依次利用式(8)(1),可得
由定理、引理2~3可得到推论1.
3 实例
给出3个应用前面结果计算群逆的实例,涉及的矩阵都是模6的剩余类环上的.
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Group inverses of a class of anti-triangular block matrix
SHENG Yuqiu
(Department of Mathematics and Physics,Qiongtai Normal University,Haikou 571127,China)
The group inverses of a class of second order anti-triangular block matrix over a ring are studied.Using the properties of group inverses of matrix and the operation skills of matrix over a ring,the necessary and sufficient conditions for the existence of group inverses of a class of second order anti-triangular block matrices was obtained.The concrete expressions of group inverses and the application examples was given.
group inverses;anti-triangular block matrix;ring
O151.21
A
10.3969/j.issn.1007-9831.2020.10.001
1007-9831(2020)10-0001-04
2020-07-15
国家自然科学基金项目(11771069,11526084)
生玉秋(1973-),女,黑龙江双城人,教授,博士,从事矩阵代数研究.E-mail:shengyuqiu1973@163.com