@Article{ATA-31-3,
author = {},
title = {On Fatou Type Convergence of Convolution Type Double Singular Integral Operators},
journal = {Analysis in Theory and Applications},
year = {2015},
volume = {31},
number = {3},
pages = {307--320},
abstract = {<p style="text-align: justify;">In this paper some approximation formulae for a class of convolution type double singular integral operators depending on three parameters of the type $$( T_{\lambda }f) ( x,y)=\int_{a}^{b}\int_{a}^{b}f(t,s) K_{\lambda}(t-x,s-y) dsdt, &nbsp;\quad &nbsp; x,y\in (a,b), \quad \lambda \in \Lambda \subset[ 0,\infty ), $$ are given. Here $f$ belongs to the function space $L_{1}( \langle a,b\rangle ^{2}),$ where $\langle a,b\rangle $ is an arbitrary interval in $\mathbb{R}$. In this paper three theorems are proved, one for existence of the operator $( T_{\lambda }f)( x,y) $ and the others for its Fatou-type pointwise convergence to $f(x_{0},y_{0}),$ as $(x,y,\lambda )$ tends to $(x_{0},y_{0},\lambda_{0}).$ In contrast to previous works, the kernel functions $K_{\lambda}(u,v)$ don&#39;t have to be $2\pi$-periodic, positive, even and radial. Our results improve and extend some of the previous results of [1,6,8,10,11,13] in three dimensional frame and especially the very recent paper [15].</p>},
issn = {1573-8175},
doi = {https://doi.org/10.4208/ata.2015.v31.n3.8},
url = {https://global-sci.com/article/73965/on-fatou-type-convergence-of-convolution-type-double-singular-integral-operators}
}