Karl Weierstrass
Karl Theodor Wilhelm Weierstrass (German: Weierstraß [ˈvaɪɐʃtʁaːs];[1] 31 October 1815 – 19 February 1897) was a German mathematician often cited as the "father of modern analysis". Despite leaving university without a degree, he studied mathematics and trained as a school teacher, eventually teaching mathematics, physics, botany and gymnastics.[2] He later received an honorary doctorate and became professor of mathematics in Berlin.
Karl Weierstrass  

Karl Weierstraß  
Born  
Died  19 February 1897 81)  (aged
Nationality  German 
Alma mater  
Known for  
Awards 

Scientific career  
Fields  Mathematics 
Institutions  Gewerbeinstitut, Friedrich Wilhelm University 
Academic advisors  Christoph Gudermann 
Doctoral students 
Among many other contributions, Weierstrass formalized the definition of the continuity of a function, proved the intermediate value theorem and the Bolzano–Weierstrass theorem, and used the latter to study the properties of continuous functions on closed bounded intervals.