# Leonhard Euler

#114,199 Most Popular

## About

One of the Switzerland's greatest mathematicians and physicists who introduced much of the mathematical terminology and notation that we use today. Most notable he introduced the concept of a function and the letter "e" as the base of the natural logarithm.

## Before Fame

He started learning at the University of Basel at the age of 13.

## Trivia

He made important discoveries in various fields, including astronomy and calculus.

## Family Life

He married Katharina Gsell on January 7, 1734.

## Associated With

Isaac Newton was another great mathematician.