"Don't worry about your marks. Just make sure that you keep up with the work and that you don't have to repeat a year. It s not necessary to have good marks in everything" Albert Einstein in letter to his son, 1916.
After Andrei Andreyevich Markov (1856-1922), a Russian mathematician, Professor at Saint Petersburg University. Markov studied sequences of mutually dependent variables, hoping to establish the limiting laws of probability in their most general form and discovered Markov chains, launched the theory of stochastic processes. As well, Markov applied the method of continued fractions, pioneered by his teacher Pafnuty Chebyshev, to probability theory, completed Chebyschev's proof of the central limit theorem (see Chapter 9) for independent non-identically distributed random variables. For entertainment, Markov was also interested in poetry and studied poetic style.
" The finest things in life include having a clear grasp of correlations. " Albert Einstein, 1919.