Results 61 to 70 of about 213 (116)

On misspecification of the dispersion matrix in mixed linear models

Mixed linear model, True model, Misspecified model, Dispersion, Random regression coefficient model, Compound symmetric, 62H12, 62F10, 62M20, 15A09,
Xu-Qing Liu, Jian-Ying Rong
core   +1 more source

A note on the formulas for the Drazin inverse of the sum of two matrices

Open Mathematics, 2019
In this paper we derive the formula of (P + Q)D under the conditions Q(P + Q)P(P + Q) = 0, P(P + Q)P(P + Q) = 0 and QPQ2 = 0. Then, a corollary is given which satisfies the conditions (P + Q)P(P + Q) = 0 and QPQ2 = 0. Meanwhile, we show that the additive
Liu Xin, Yang Xiaoying, Wang Yaqiang
doaj   +1 more source

What is a proper graph Laplacian? An operator-theoretic framework for graph diffusion

Special Matrices
We introduce an operator-theoretic definition of a proper graph Laplacian as any matrix associated with a given graph that can be expressed as the composition of a divergence and a gradient operator, with the gradient acting between graph-related spaces ...
Estrada Ernesto
doaj   +1 more source

Trace inequalities for positive semidefinite matrices

Discussiones Mathematicae - General Algebra and Applications, 2017
Certain trace inequalities for positive definite matrices are generalized for positive semidefinite matrices using the notion of the group generalized inverse.
Choudhury Projesh Nath, Sivakumar K.C.
doaj   +1 more source

A Hadamard product involving inverse-positive matrices

Special Matrices, 2015
In this paperwe study the Hadamard product of inverse-positive matrices.We observe that this class of matrices is not closed under the Hadamard product, but we show that for a particular sign pattern of the inverse-positive matrices A and B, the Hadamard
Gassó Maria T., Torregrosa Juan R., Abad Manuel F.   +2 more
doaj   +1 more source

LMI approach to robust stability and stabilization of nonlinear uncertain discrete-time systems with convex polytopic uncertainties

, 2012
This article addresses the robust stability for a class of nonlinear uncertain discrete-time systems with convex polytopic of uncertainties. The system to be considered is subject to both interval time-varying delays and convex polytopic-type ...
M. Rajchakit, G. Rajchakit
semanticscholar   +1 more source

Improvements in the upper bounds for the spread of a matrix

, 2015
In this paper, we present some new upper bounds for the spread of a matrix. These bounds improve the previous results. In addition, one of these bounds can be up to the optimum.
Pingping Zhang, Hu Yang
semanticscholar   +1 more source

Evaluación de Bacterias Aerobias Formadoras de Endospora (BAFEs) de suelos rizosféricos, como agentes de control biológico de Burkholderia glumae [PDF]

, 2016
El añublo bacterial de la panícula es una enfermedad que causa la reducción de hasta el 75% del rendimiento del cultivo del arroz y el agente causal principal es la bacteria Burkholderia glumae.
Pedraza Herrera, Luz Adriana
core  

A NOVEL CRITERION FOR GUARANTEED COST CONTROL FOR UNCERTAIN SWITCHED RECURRENT NEURAL NETWORKS

, 2014
This paper studies the problem of guaranteed cost control for a class of uncertain switched recurrent delayed neural networks. The time delay is a continuous function belonging to a given interval, but not necessary to be differentiable.
G. Rajchakit
semanticscholar   +1 more source

Weak group inverse

Open Mathematics, 2018
In this paper, we introduce the weak group inverse (called as the WG inverse in the present paper) for square complex matrices of an arbitrary index, and give some of its characterizations and properties.
Wang Hongxing, Chen Jianlong
doaj   +1 more source