arXiv subjects

Irina Limonova

Publications and source records attributed to Irina Limonova.

3 recordsLinked to original sources

arXiv2024

One-sided discretization inequalities and sampling recovery

Recently, in a number of papers it was understood that results on sampling discretization and on the universal sampling discretization can be successfully used in the problem of sampling recovery. Moreover, it turns out that it is sufficient to only have a one-sided discretization inequality for some of those applications. This motivates us to write the present paper as a survey/research paper with the focus on the one-sided discretization inequalities and their applications in the sampling recovery. In this sense the paper complements the two existing survey papers on sampling discretization.

math.NA↗

arXiv2021

On sampling discretization in $L_2$

We prove a sampling discretization theorem for the square norm of functions from a finite dimensional subspace satisfying Nikol'skii's inequality with an upper bound on the number of sampling points of the order of the dimension of the subspace

math.FA↗

arXiv2020

Decomposing a matrix into two submatrices with extremely small operator norm

We give sufficient conditions on a matrix A ensuring the existence of a partition of this matrix into two submatrices with extremely small norm of the image of any vector. Under some weak conditions on a matrix A we obtain a partition of A with the extremely small $(1,q)$-norm of submatrices.

math.FA↗