On one Euler formula

Abstract

In April 1957, the Academy of Sciences of the USSR together with the Academy of Sciences in Berlin celebrated the 250th anniversary of the birth of its famous fellow member Leonhard Euler. The birthday of the great scientist was remembered by mathematicians all over the world and more than one of them dwelt on his works. The Leningrad Mining Institute, within whose walls, according to legend, the great mathematician used to visit, also remembered him.