Mathematician:Luitzen Egbertus Jan Brouwer

Known to his friends as "Bertus".

Dutch mathematician working in topology, set theory, measure theory and complex analysis.

Founded the mathematical philosophy of intuitionism.

Nationality
Dutch

History

 * Born: February 27, 1881
 * Died: December 2, 1966

Theorems and Definitions

 * Brouwer's Fixed Point Theorem
 * Brouwer-Heyting-Kolmogorov Interpretation (with Arend Heyting, independently of Andrey Kolmogorov)

Books and Papers

 * 1923: On the significance of the principle of excluded middle in mathematics, especially in function theory
 * 1927: On the domains of definition of functions
 * 1927: Intuitionistic reflections on formalism