Results 111 to 120 of about 54,917 (203)

Some inequalities for unitarily invariant norms of matrices

Journal of Inequalities and Applications, 2011
This article aims to discuss inequalities involving unitarily invariant norms. We obtain a refinement of the inequality shown by Zhan. Meanwhile, we give an improvement of the inequality presented by Bhatia and Kittaneh for the Hilbert-Schmidt norm ...
Wang Shaoheng, Zou Limin, Jiang Youyi
doaj  

Transversal zeros and positive semidefinite forms [PDF]

, 1982
Choi, Man-Duen, Knebusch, Manfred, Lam, Tsit-Yuen, Reznick, Bruce   +3 more
core   +1 more source

Structural Results on the HMLasso

Axioms
HMLasso (Lasso with High Missing Rate) is a useful technique for sparse regression when a high-dimensional design matrix contains a large number of missing data. To solve HMLasso, an appropriate positive semidefinite symmetric matrix must be obtained. In
Shin-ya Matsushita, Hiromu Sasaki
doaj   +1 more source

Positive semi-definite matrices, exponential convexity for multiplicative majorization and related means of Cauchy's type

Journal of Numerical Analysis and Approximation Theory, 2010
In this paper, we obtain new results concerning the generalizations of additive and multiplicative majorizations by means of exponential convexity. We prove positive semi-definiteness of matrices generated by differences deduced from majorization type ...
Naveed Latif, Josip Pečarić
doaj   +2 more sources

On vector configurations that can be realized in the cone of positive matrices

, 2010
Let $v_1$,..., $v_n$ be $n$ vectors in an inner product space. Can we find a natural number $d$ and positive (semidefinite) complex matrices $A_1$,..., $A_n$ of size $d \times d$ such that ${\rm Tr}(A_kA_l)= $ for all $k,l=1,..., n$? For such matrices to
Frenkel, Péter E., Weiner, Mihály
core  

APPROXIMATING SYMMETRIC POSITIVE SEMIDEFINITE TENSORS OF EVEN ORDER(). [PDF]

SIAM J Imaging Sci, 2012
Barmpoutis A, Jeffrey H, Vemuri BC.
europepmc   +1 more source

Positive Semidefinite Rank-based Correlation Matrix Estimation with Application to Semiparametric Graph Estimation. [PDF]

J Comput Graph Stat, 2014
Zhao T, Roeder K, Liu H.
europepmc   +1 more source

A Positive Semidefinite Safe Approximation of Multivariate Distributionally Robust Constraints Determined by Simple Functions. [PDF]

J Optim Theory Appl
Dienstbier J, Liers F, Rolfes J.
europepmc   +1 more source

Computation of the smooth max-mutual information via semidefinite programming. [PDF]

Quantum Inf Process
Popp C, Sutter TC, Hiesmayr BC.
europepmc   +1 more source

Constrained shadow tomography for molecular simulation on quantum devices. [PDF]

Chem Sci
Avdic I, Wang Y, Rose M, Payne Torres LI, Schouten AO, Sung KJ, Mazziotti DA.   +6 more
europepmc   +1 more source