Grigoryan, Martin G.; Galoyan, Levon N. Functions universal with respect to the trigonometric system. (English. Russian original) Zbl 1464.42003 Izv. Math. 85, No. 2, 241-261 (2021); translation from Izv. Ross. Akad. Nauk, Ser. Mat. 85, No. 2, 73-94 (2021). MSC: 42A16 43A15 PDFBibTeX XMLCite \textit{M. G. Grigoryan} and \textit{L. N. Galoyan}, Izv. Math. 85, No. 2, 241--261 (2021; Zbl 1464.42003); translation from Izv. Ross. Akad. Nauk, Ser. Mat. 85, No. 2, 73--94 (2021) Full Text: DOI
Grigoryan, Martin; Galoyan, Levon On Fourier series that are universal modulo signs. (English) Zbl 1426.42003 Stud. Math. 249, No. 2, 215-231 (2019). MSC: 42A16 42B05 PDFBibTeX XMLCite \textit{M. Grigoryan} and \textit{L. Galoyan}, Stud. Math. 249, No. 2, 215--231 (2019; Zbl 1426.42003) Full Text: DOI
Grigoryan, M. G.; Galoyan, L. N. On the universal functions. (English) Zbl 1380.42003 J. Approx. Theory 225, 191-208 (2018). MSC: 42A16 PDFBibTeX XMLCite \textit{M. G. Grigoryan} and \textit{L. N. Galoyan}, J. Approx. Theory 225, 191--208 (2018; Zbl 1380.42003) Full Text: DOI
Grigoryan, M. G.; Galoyan, L. N. On the uniform convergence of negative order Cesaro means of Fourier series. (English) Zbl 1331.42004 J. Math. Anal. Appl. 434, No. 1, 554-567 (2016). MSC: 42A24 40G05 PDFBibTeX XMLCite \textit{M. G. Grigoryan} and \textit{L. N. Galoyan}, J. Math. Anal. Appl. 434, No. 1, 554--567 (2016; Zbl 1331.42004) Full Text: DOI