On the existence of a positive definite solution of the matrix equation X+AXA=I

Matrices;mathematics

On the Matrix (I + X)-1

In this note we consider the question under which conditions all entries of the matrix I-(I+X)-1 are nonnegative in case matrix X is a real positive definite matrix.Sufficient conditions are presented as well as some necessary conditions.One sufficient condition is that matrix X-1 is an inverse M-matrix.A class of matrices for which the inequality holds is presented.matrices

Calculation of an approximate solution of the infinite time-varying LQ-problem

Linear Programming;Algorithm;Optimal Control;operations research

Admissible target paths in economic models

Social Psychology;econometrics

Local strong D-Monotonicity of the Kalai-Smorodinsky and Nash bargaining solution

bargaining

Is there room for convergence in the E.C.?

EEC