Note_1

"If $A$ is a success in life, then $A$ equals $x$ plus $y$ plus $z.$ Work is $x;$ $y$ is play; and $z$ is keeping your mouth shut." Albert Einstein, 1950

Note_2

After James (Jakob) Bernoulli (1654 -- 1705), a Swiss member of a family of eight mathematicians, who started his professional life in the ministry, and is responsible Bernoulli's Theorem as well as many of the combinatorial results in these notes.

Note_3

After Siméon Denis Poisson (1781-1840), a French mathematician who was supposed to become a surgeon but, fortunately for his patients, failed medical school for lack of coordination. He was forced to do theoretical research, being too clumsy for anything in the lab. He wrote a major work on probability and the law, Recherchés sur la probabilité des jugements en matière criminelle et matière civile (1837), discovered the Poisson distribution (called law of large numbers) and to him is ascribed one of the more depressing quotes in our discipline "Life is good for only two things: to study mathematics and to teach it"