xxx> From memories of school years: "Children! Remember that the basis of natural logarithms is marked by the letter e in honor of Leonard Euler, and to remember its decimal signs is very simple. Two and seven remember everything. In 1828, Leo Nikolaevich Tolstoy was born. Then again in 1828, the year of the birth of Jules Verne, and if you are stupid, then again the year of the birth of Tolstoy.