Geodesic
Characterization of compact linear integral operators in the space of functions of bounded variation
Piotr Kasprzak1
1 Adam Mickiewicz University in Poznań, Faculty of Mathematics and Computer Science
Annales Fennici Mathematici, Tome 46 (2021) no. 2, pp. 795-818 Cet article a éte moissonné depuis la source Journal.fi

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  Although various operators in the space of functions of bounded variation have been studied by quite a few authors, no simple necessary and sufficient conditions guaranteeing compactness of linear integral operators acting in such spaces have been known. The aim of the paper is to fully characterize the class of kernels which generate compact linear integral operators in the BV-space. Using this characterization we show that certain weakly singular and convolution operators (such as the Abel and Volterra operators), when considered as transformations of $BV[a,b]$, are compact. We also provide a detailed comparison of those new necessary and sufficient conditions with various other conditions connected with compactness of linear (integral) operators in the space of functions of bounded variation which already exist in the literature.
Keywords: Abel operator, bounded variation, compact linear operator, convolution kernel, integral operator, space of functions of bounded variation, Volterra operator, weakly singular kernel

Piotr Kasprzak 1

1 Adam Mickiewicz University in Poznań, Faculty of Mathematics and Computer Science 
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Piotr Kasprzak. Characterization of compact linear integral operators  in the space of functions of bounded variation. Annales Fennici Mathematici, Tome 46 (2021) no. 2, pp. 795-818. http://geodesic.mathdoc.fr/item/AFM_2021_46_2_a13/