In the 20th century, many universal influential mathematicians around the world (especially in Russia) made positive impacts on our world and produced great contributions to diverse subjects and extremely important developments in the field of Mathematics, among them Andrei Nikolaïevitch Tikhonov, one of the ground-breaking outstanding minds who has always been involved in the training of able scientists and specialists.

Hayat Rezgui is a Doctor of Sciences (in Mathematics). She currently works at the Department of Mathematics, ÉNS de Kouba (Algiers, Algeria) as a University lecturer / researcher. She does research in Mathematical Physics, Optics, Multiresolutions, Algebra and Number Theory. She has several publications (in renowned journals).