趙琳琳

(德州學(xué)院數(shù)學(xué)系,山東德州 253023)

算子方程AX+X*B=C的解

趙琳琳

(德州學(xué)院數(shù)學(xué)系,山東德州 253023)

利用算子的廣義逆及相關(guān)投影,研究了一類算子方程的可解性,得到了方程可解的若干條件,并給出了解的一般表示.最后利用算子的矩陣表示,得到了此類算子方程可解的又一充要條件,進(jìn)而豐富了這方面的研究.

Hilbert空間；算子方程；Moore-Penrose逆

1 引言

令H,K表示任意的Hilbert空間,B(H,K)表示從H到K的所有有界線性算子的集合,記B(H,H)=B(H).對(duì)給定的算子A∈B(H,K),B∈B(K,H),C∈B(K),本文研究算子方程

2 主要結(jié)果

顯然,(8)式有解等價(jià)于(12),(13)式有公共解.由引理2.1,得,

命題得證.

[1]Djordjevic D S.Explicit solution of the operator equation A*X+X*A=B[J].J.Comput.Appl.Math., 2007,200:701-704.

[2]Xu Q X,Sheng L J,Gu Y Y.The solutions to some operator equations[J].Linear Algebra Appl.,2008,429:1997-2024.

[3]田學(xué)剛,王少英.算子方程AX-XA*=B的正解與實(shí)正解[J].純粹數(shù)學(xué)與應(yīng)用數(shù)學(xué),2010,26(6):1047-1052.

[4]Piao F X,Zhang Q L,Wang Z F.Thesolution to matrix equation AX+XTC=B[J].Journal of the Franklin Institute,2007,344:1056-1062.

[5]Ben-Israel A,Greville T N E.Generalized Inverses Theory and Applications[M].2nd ed.NewYork:Springer, 2003.

[6]Dajic A,Koliha J J.Positive solution to the equations AX=B and XB=D for Hilbert space operators[J]. J.Math.Anal.Appl.,2007,333:567-576.

Solutions of the operator equation AX+X*B=C

Zhao Linlin

(Department of Mathematics,Dezhou University,Dezhou253023,China)

A class of the operator equations is studied by using the general inverse of the operator and its related projectors,some solvability conditions and a general solution to this equation are obtained.Finally,using the matrix form of the operator,another necessary and sufficient condition for the solvability of such operator equation is derived.These results enrich the research in this area.

Hilbert space,operator equation,Moore-Penrose inverse

O177

A

1008-5513(2012)04-0469-06

2011-08-03.

國(guó)家自然科學(xué)基金(10971070,11071079).

趙琳琳(1981-),博士,講師,研究方向：數(shù)值代數(shù).

2010 MSC:47A62