Giuseppe Vitali (1875 - 1932) was an Italianmathematician, remembered for the Vitali theorem on the existence of non-measurable sets of real numbers. 1875 (MDCCCLXXV) was a common year starting on Friday (see link for calendar). ... 1932 (MCMXXXII) was a leap year starting on Friday (the link will take you to a full 1932 calendar). ... Leonhard Euler is considered by many people to be one of the greatest mathematicians of all time A mathematician is a person whose primary area of study and research is mathematics. ... In mathematics, the Vitali set is an elementary example of a set of real numbers that is not Lebesgue measurable. ... In mathematics, a non-measurable set is a set whose structure is so complicated it sheds light on the very notion of length, area or volume. ... In mathematics, the real numbers are intuitively defined as numbers that are in one-to-one correspondence with the points on an infinite lineâthe number line. ...