In 1741, Frederick the Great made him a member of the Berlin Academy, where he produced a steady stream of mathematical works, despite being blind in one eye.  
In 1741, Frederick the Great made him a member of the Berlin Academy, where he produced a steady stream of mathematical works, despite being blind in one eye.  The author of the Konigsberg Bridge problem, the equation "e to the i times theta equals cosine theta plus i times sine theta" is known as his identity, and he was the first to introduce the capital sigma as a symbol for sum, as well as pi for that transcendental number.  FTP, name this Swiss mathematician.
In 1741, Frederick the Great made him a member of the Berlin Academy, where he produced a steady stream of mathematical works, despite being blind in one eye.  
Leonhard Euler