90 Years of the Birth of Prof. Docho Dochev and to his Memory (1932–2021)

[Kiryakova Virginia; Кирякова Виржиния]; [Kenderov Petar; Кендеров Петър]; [Tersian Stepan; Терзиян Степан]This article is dedicated to the memory of Professor Docho Todorov Dochev, who left us on October 11th, 2021, just two months before his 90th anniversary. A teacher and scientist with a Renaissance spirit, deeply devoted to mathematics education for the young talented pupils and to the development of mathematics in Bulgarian schools and universities, a distinguished member of the Union of Bulgarian Mathematicians