The most difficult math­e­ma­ti­cians riddles

Carl Friedrich Gauss was a German mathematician who made significant contributions to many fields including number theory, algebra, statistics, analysis, differential geometry, geodesy, geophysics, mechanics, electrostatics, magnetic fields, astronomy, matrix theory, and optics.

In 1645, brilliant mathematician Blaise Pascal invented roulette based on his mathematical interest in probability calculus. Initially, there was no "zero" field in the game, it was added later to increase the profits of the casinos.

Eratosthenes of Cyrene was the chief librarian at the Library of Alexandria. He is best known for being the first person to calculate the circumference of the Earth. He did it by measuring Sun's angle of elevation at noon on the solstice in Alexandria, knowing, that at the same time the Sun is at Zenith in the Ancient Egyptian city of Swenet, 5000 stades from Alexandria. Seventeen hundred years after Christopher Columbus studied Eratosthenes writings and decided that the calculations were wrong, and the Earth must be smaller - which led him to seek India in the west.