English

The pointwise limit of metric integral operators approximating set-valued functions

Functional Analysis 2023-04-26 v1

Abstract

For set-valued functions (SVFs, multifunctions), mapping a compact interval [a,b][a,b] into the space of compact non-empty subsets of Rd{\mathbb R}^d, we study approximation based on the metric approach that includes metric linear combinations, metric selections and weighted metric integrals. In our earlier papers we considered convergence of metric Fourier approximations and metric adaptations of some classical integral approximating operators for SVFs of bounded variation with compact graphs. While the pointwise limit of a sequence of these approximants at a point of continuity xx of the set-valued function FF is F(x)F(x), the limit set at a jump point was earlier described in terms of the metric selections of the multifunction. Here we show that, under certain assumptions on FF, the limit set at xx equals the metric average of the left and the right limits of FF at xx, thus extending the case of real-valued functions.

Keywords

Cite

@article{arxiv.2304.12375,
  title  = {The pointwise limit of metric integral operators approximating set-valued functions},
  author = {Elena E. Berdysheva and Nira Dyn and Elza Farkhi and Alona Mokhov},
  journal= {arXiv preprint arXiv:2304.12375},
  year   = {2023}
}

Comments

arXiv admin note: text overlap with arXiv:2212.00439, arXiv:2008.10340

R2 v1 2026-06-28T10:16:20.818Z