მწკრივის ორჯერ გაწარმოებით მიღებული მწკრივის ბორელის მეთოდით  შეჯამებადობის შესახებ

Ketevan Shvangiradze

On Summarization by Borel’s method of the row obtained by producing the row twice

Authors

Ketevan Shvangiradze

Keywords:

Double Fourier series, mixed derivative, summability, Borel’s method.

Abstract

The paper shows the summability at a point of the series obtained by multiplying the Fourier double series of a 2π
periodic function of two variables by the Borel method, when the function has a mixed integral derivative of the second order
at this point.