Analytical approaches for definition of functions with variable period and information technology for determining of Fourier coefficients Journal title: Vìsnik Nacìonalʹnogo unìversitetu "Lʹvìvsʹka polìtehnìka". Serìâ Ìnformacìjnì sistemi ta merežì Authors: M. Pryymak, Lesya Dmytrotsa, Marija Olijnyk Subject(s):