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74.512  Articles
1 of 7.452 pages  |  10  records  |  more records»
We study interconnection between sufficient conditions of Hörmander and Hardy-Littlewood-Sobolev types of boundedness of integral convolution operators in symmetric spaces.

The object of this study is the Friedrichs model in the case of one-dimensional perturbation of the multiplication operator by an independent variable. One of the most problematic places in this theory is when the number of eigenvalues is infinite. Theref... see more

The object of this study is the Friedrichs model in the case of one-dimensional perturbation of the multiplication operator by an independent variable. One of the most problematic places in this theory is when the number of eigenvalues is infinite. Theref... see more

We consider nonlocal boundary value problems which includes discontinuous coefficients elliptic differential operator equations of the second order and nonlocal boundary conditions together with boundary-transmission conditions. We prove coerc... see more

In the paper we are going to introduce a weighted composition operator-valued integral on L2(X) with a weakly integrable weight function u and we will consider some classic properties of these kind operators.Then we will give the necessary and sufficienti... see more

The purpose of the paper is to develop the substantiation of a multilevel subjective interaction of market logistics services participants taking into account the risks conditions in supply chains. Methodology. The research is based on the use of the foll... see more

Suppose E is a vector valued sequence space with operator valued ß-dual EßY . If the space E satisfies certain gliding hump conditions, we consider the connection between pointwise bounded subsets A of EßY and the uniform convergence of the elements of A.... see more

This paper deals with the investigation on the direct scattering problem forSturm-Liouville operator containing both the discontinuous coefficient and the discontinuity conditions at some point on the positive half line. The integral representation of Jos... see more

The present work starts from the premise that since in the summer season 2019, on the tourism market in the northeast of Romania, six major tour organizers (tour operators) of holiday packages have addressed their activity explicitly to the citizens of Su... see more

1 of 7.452 pages  |  10  records  |  more records»