Leonhard added many different notations to modern mathematics. Most of the notation used today was introduced by
Euler.
Here are some of the notations he introduced:
 sine
 cosine
 e
 pi
 sigma
 f for function
 i
Leonhard also set foundations of continuum mechanics and lunar theory. He is said to have come up with so many
different theories and ideas that most of them are not credited to him. Euler also came up with some theorems. Two of them
are The Sumation of Series, and the Konigsburg Bridge Theorem.
