Theorem 3 of Baksalary and Pukelsheim [Linear Algebra Appl. 151 (1991) 135] asserts that if both A and B are Hermitian nonnegative definite matrices, then the star order A \* B between them and the star order A 2 \* B 2 between their squares are equivalent and they imply the commutativity property A
Relationships between partial orders of matrices and their powers
β Scribed by Jerzy K Baksalary; Jan Hauke; Xiaoji Liu; Sanyang Liu
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 190 KB
- Volume
- 379
- Category
- Article
- ISSN
- 0024-3795
No coin nor oath required. For personal study only.
β¦ Synopsis
Baksalary and Pukelsheim [Linear Algebra Appl. 151 (1991)
135] considered the problem of how an order between two Hermitian nonnegative definite matrices A and B is related to the corresponding order between the squares A 2 and B 2 , in the sense of the star partial ordering, the minus partial ordering, and the LΓΆwner partial ordering. In the present paper, possibilities of generalizing and strengthening their results are studied from two points of view: by widening the class of matrices considered and by replacing the squares by arbitrary powers.
π SIMILAR VOLUMES
In this note we revisit the sharp partial order introduced by Mitra [S.K. Mitra, On group inverses and the sharp order, Linear Algebra Appl. 92 (1987) 17-37]. We recall some already known facts from certain matrix decompositions and derive new statements, relating our discussion to recent results in
GroΓ [Linear Algebra Appl. 326 (2001) 215] developed characterizations of the minus and star partial orders between the squares of Hermitian nonnegative definite matrices referring to the concept of the space preordering. In the present paper, his results are generalized by deleting the nonnegative