Johann Heinrich Lambert

Johann Heinrich Lambert (German: [ˈlambɛʁt], Jean-Henri Lambert in French; 1728 –1777) Swiss German mathematician, astronomer, physicist, and philosopher. In 1761, he proved that 

π

is irrational.

External links

• O’Connor, John J.; Robertson, Edmund F., “Johann Heinrich Lambert”, MacTutor History of Mathematics archive, University of St Andrews, http://www-history.mcs.st-andrews.ac.uk/Biographies/Lambert.html .
• Johann Heinrich Lambert, ©2016 Encyclopædia Britannica, Inc.