Inequalities on 2 × 2 block positive semidefinite matrices

2021 ◽  
pp. 1-10
Author(s):  
Xiaohui Fu ◽  
Pan-Shun Lau ◽  
Tin-Yau Tam
Keyword(s):  
Positive Semidefinite ◽  
Positive Semidefinite Matrices

scholarly journals A trace bound for integer-diagonal positive semidefinite matrices

2020 ◽  
Vol 8 (1) ◽  
pp. 14-16
Author(s):  
Lon Mitchell
Keyword(s):  
Positive Semidefinite ◽  
Positive Semidefinite Matrix ◽  
Positive Semidefinite Matrices ◽  
Semidefinite Matrix

AbstractWe prove that an n-by-n complex positive semidefinite matrix of rank r whose graph is connected, whose diagonal entries are integers, and whose non-zero off-diagonal entries have modulus at least one, has trace at least n + r − 1.

scholarly journals Fischer Type Log-Majorization of Singular Values on Partitioned Positive Semidefinite Matrices

2021 ◽  
Vol 2021 ◽  
pp. 1-5
Author(s):  
Benju Wang ◽  
Yun Zhang
Keyword(s):  
Singular Values ◽  
Positive Semidefinite ◽  
Positive Semidefinite Matrices ◽  
Fischer’S Inequality ◽  
New Inequalities

In this paper, we establish a Fischer type log-majorization of singular values on partitioned positive semidefinite matrices, which generalizes the classical Fischer's inequality. Meanwhile, some related and new inequalities are also obtained.

scholarly journals A Characterization of Polynomial Density on Curves via Matrix Algebra

Mathematics ◽  
2019 ◽  
Vol 7 (12) ◽  
pp. 1231
Author(s):  
Carmen Escribano ◽  
Raquel Gonzalo ◽  
Emilio Torrano
Keyword(s):  
Matrix Algebra ◽  
Optimization Problems ◽  
Positive Semidefinite ◽  
Point Of View ◽  
Alternative Proof ◽  
General Context ◽  
Positive Semidefinite Matrices ◽  
Jordan Curves ◽  
Point Evaluations

In this work, our aim is to obtain conditions to assure polynomial approximation in Hilbert spaces L 2 ( μ ) , with μ a compactly supported measure in the complex plane, in terms of properties of the associated moment matrix with the measure μ . To do it, in the more general context of Hermitian positive semidefinite matrices, we introduce two indexes, γ ( M ) and λ ( M ) , associated with different optimization problems concerning theses matrices. Our main result is a characterization of density of polynomials in the case of measures supported on Jordan curves with non-empty interior using the index γ and other specific index related to it. Moreover, we provide a new point of view of bounded point evaluations associated with a measure in terms of the index γ that will allow us to give an alternative proof of Thomson’s theorem, by using these matrix indexes. We point out that our techniques are based in matrix algebra tools in the framework of Hermitian positive definite matrices and in the computation of certain indexes related to some optimization problems for infinite matrices.

scholarly journals A class of positive semidefinite matrices

1987 ◽  
Vol 93 ◽  
pp. 121-126
Author(s):  
A.M. Russell ◽  
C.J.F. Upton
Keyword(s):  
Positive Semidefinite ◽  
Positive Semidefinite Matrices

scholarly journals Trace inequalities for positive semidefinite matrices

2017 ◽  
Vol 37 (1) ◽  
pp. 93 ◽  
Author(s):  
Projesh Nath Choudhury ◽  
K.C. Sivakumar
Keyword(s):  
Positive Semidefinite ◽  
Positive Semidefinite Matrices ◽  
Trace Inequalities

scholarly journals Phase retrieval using random cubatures and fusion frames of positive semidefinite matrices

2015 ◽  
Vol 1 (1) ◽  
Author(s):  
Martin Ehler ◽  
Manuel Gräf ◽  
Franz J. Király
Keyword(s):  
Phase Retrieval ◽  
Positive Semidefinite ◽  
Positive Semidefinite Matrices ◽  
Fusion Frames

scholarly journals Affine processes on positive semidefinite matrices

2011 ◽  
Vol 21 (2) ◽  
pp. 397-463 ◽  
Author(s):  
Christa Cuchiero ◽  
Damir Filipović ◽  
Eberhard Mayerhofer ◽  
Josef Teichmann
Keyword(s):  
Positive Semidefinite ◽  
Positive Semidefinite Matrices ◽  
Affine Processes
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