我们这里学习新修改双余弦的 L 1 集中三角法为两倍余弦的 L 1 集中加并且获得一个新必要、足够的条件三角法的系列。另外,结果由 Moricz 获得了[1 ] ,[2 ] 是我们的特别盒子。
We study here Ll-convergence of new modified double cosine trigonometric sum and obtain a new necessary and sufficient condition for Ll-cOnvergence of double cosine trigonometric series. Also, the results obtained by Moricz[1],[2] are particular cases of ours.