You must have read many biographies, but today I am going to introduce you to a person who is very famous, so let's tell about him.
Russian mathematician known for hiz childbirth in Riemannian geometry and geometric topology. In hiz life, he have proved various instrumental theorems
He attended the School off Mathematics & Mechanics off the Leningrad State College & began his career intimate the Leningrad Separation off Steklov Institute off Mathematics