August 26, 1725 (, Otomi July 19), the German mathematician and physicist Lambert was born.



Lambert was born "target =" _blank "> Lambert (Johann Heinrich Lambert) (1728 -1777 years, September 25, 2011), the German mathematician. The father was a tailor to school, 12-year-old to help his father work, evening study hall. since the age of 15, Lambert worked as clerks, newspaper secretary and private teachers do private teachers, he learned with the proprietor of the huge library strike. Optical
the research
first time introduction of hyperbolic functions the trigonometry
non-Euclidean geometry, including angle and area of ​​the hyperbolic triangle.
proved that �� is an irrational number.

Comments: a very remarkable mathematical genius, many are relying on self-knowledge to the