Google doodle honors Leonhard Euler
Euler, who is said to be the most important mathematician of the 18th century, was born in 1707 in Basel, Switzerland. After receiving higher education, he joined the university of Basel in switzerland at the age of thirteen and a few years later received a master of philosophy.
He traveled to Russia to take up position at the the Russian Academy of Sciences and later moved to Berlin Germany due to a bad political situation in Russia, he later returned when things calmed down, accepted a position at St, Petersburg Academy and spent the rest of his life in Russia.
The mathematician is famous for the introduction of famous notational conventions, with the V − E + F = 2 the formula being one of them.