The Importance of Mathematics

I can't help thinking mathematics part of the day how old are you at this point when you read the book on the drawing I was well into my 20s so it was very very late for mathematician because most mathematicians actually wake up to some kind of mathematics in the mid-teenage. The only source of advice that I could think of was Landau himself in the book, Vicha Mathematica Buprogini by three authors called Danco and the pop of Kojevnikova. After about three months this set in two volumes contain 3500 or so exercises he says.