一类算子的换位代数的K群
2015-07-18郭献洲张相梅
郭献洲,张相梅
(河北工业大学理学院,天津 300401)
一类算子的换位代数的K群
郭献洲,张相梅
(河北工业大学理学院,天津 300401)
0 引言
Schur定理每1个n×n矩阵在酉等价意义下可以唯一地写成有限个不可约算子的直和.
Jordan标准型定理每1个n×n矩阵在相似意义下可以唯一地写成有限个强不可约算子的直和.
显然,1个n×n矩阵A是强不可约的当且仅当A相似于1个n×n的Jordan块.江泽坚指出强不可约
1 定理的证明
2 例子
[1]Jiang C L,Wang Z Y.Strongly irreducible operators on Hilbert space[M].Research Notes in Math 389.(Longman,Harlow,Essex,1998)
[2]Jiang Z J.Some questions concerning BIR operators,I,II,The reports at the functional analysis seminar of Jilin Univ,Changchun,1979.
[3]Jiang Z J.On linear operator structure.The report at Chinese operator theory conference.Jiujiang,1981.
[4]Halmos P R.Irreducible operators[J].M ich M ath J,1968,15:215-223.
[5]Blackadar B.K Theory for Operator Algebras[M].Heidelberg:Springer-Verlag,1986.
[6]Cao Y,Fang J S,Jiang C L.K Group of Banach A lgebra and strongly irreducible decomposition of operators[J].J Operator Theory,2002,48:235-253.
[责任编辑 杨屹]
The K groups of commutant algebras of a class of operators
GUO Xianzhou,ZHANG Xiangmei
(School of Science,Hebei University of Technology,Tianjin 300401,China)
1007-2373(2015)06-0073-03
10.14081/j.cnki.hgdxb.2015.06.014
2015-05-15
国家自然科学基金(11171087,10701031)
郭献洲(1976-),男(汉族),副教授.
数字出版日期:2015-12-17数字出版网址:http://www.cnki.net/kcms/detail/13.1208.T.20151217.1509.008.htm l