数学物理学报(英文版) ›› 2015, Vol. 35 ›› Issue (1): 275-280.doi: 10.1016/S0252-9602(14)60156-9

• 论文 • 上一篇    

SOME FURTHER NOTES ON THE MATRIX EQUATIONS ATXB + BTXTA = C ANDATXB + BTXA = C

G.SOARES   

  1. Center of Mathematics, University of Tr´as-os-Montes of Alto Douro, Apartado 1013, 5001-801 Vila Real, Portugal
  • 收稿日期:2013-11-06 修回日期:2014-02-21 出版日期:2015-01-20 发布日期:2015-01-20
  • 基金资助:

    This work was partially supported by FCT (Portugal)  with national funds through Centro de Matem´atica da Universidade de Tr´as-os-Montes e Alto Douro (PEst-OE/MAT/UI4080/2014).

SOME FURTHER NOTES ON THE MATRIX EQUATIONS ATXB + BTXTA = C ANDATXB + BTXA = C

G.SOARES   

  1. Center of Mathematics, University of Tr´as-os-Montes of Alto Douro, Apartado 1013, 5001-801 Vila Real, Portugal
  • Received:2013-11-06 Revised:2014-02-21 Online:2015-01-20 Published:2015-01-20
  • Supported by:

    This work was partially supported by FCT (Portugal)  with national funds through Centro de Matem´atica da Universidade de Tr´as-os-Montes e Alto Douro (PEst-OE/MAT/UI4080/2014).

摘要:

Dehghan and Hajarian, [4], investigated the matrix equations ATXB+BTXTA = C and ATXB + BTXA = C providing inequalities for the determinant of the solutions of these equations. In the same paper, the authors presented a lower bound for the product of the eigenvalues of the solutions to these matrix equations. Inspired by their work, we give some generalizations of Dehghan and Hajarian results. Using the theory of the numerical ranges, we present an inequality involving the trace of C when A,B,X are normal matrices satisfying ATB = BAT

关键词: matrix equation, eigenvalue, trace, permutation matrix

Abstract:

Dehghan and Hajarian, [4], investigated the matrix equations ATXB+BTXTA = C and ATXB + BTXA = C providing inequalities for the determinant of the solutions of these equations. In the same paper, the authors presented a lower bound for the product of the eigenvalues of the solutions to these matrix equations. Inspired by their work, we give some generalizations of Dehghan and Hajarian results. Using the theory of the numerical ranges, we present an inequality involving the trace of C when A,B,X are normal matrices satisfying ATB = BAT

Key words: matrix equation, eigenvalue, trace, permutation matrix

中图分类号: 

  • 15A24