Supported in part by the National Key Research and Development Program of China(No.2021YFA1000700);Natural Science Basic Research Program of Shaanxi(Nos.2023-JC-QN-0024,2023-JC-YB-077);Foundation of Shaanxi Educational Committee(No.2023-JC-YB-013);Shaanxi Fundamental Science Research Project for Mathematics and Physics(No.22JSQ010)。
Supported financially in part by the National Key Research and Development Program of China(No.2021YFA1000700);Natural Science Basic Research Program of Shaanxi(Nos.2023-JC-QN-0024,2023-JCYB-077);Foundation of Shaanxi Educational Committee(No.2023-JCYB-013);Shaanxi Fundamental Science Research Project for Mathematics and Physics(No.22JSQ010)
Supported in part by NSFC(No.1041001)and Zhejiang Provincial Natural Science Foundations of China(No.101009)
In Fourier analysis, since Fourier coefficients are computable and applicable, people have already established many nice results by assuming monotonicty of the coefficients. One famous classical result is done by Chau...