Mathematician:Alexander Markowich Ostrowski

Full name in Russian: Алекса́ндр Ма́ркович Остро́вский.

Contributed towards the fields of determinants, linear algebra, algebraic equations, multivariate algebra, formal algebra, number theory, geometry, topology, convergence, theory of real functions, differential equations, differential transformations, theory of complex functions, conformal mappings, numerical analysis and others.

Nationality
Ukrainian

History

 * Born: 25 September 1893 in Kiev, Ukraine (then part of the Russian Empire)
 * Died: 20 November 1986 in Montagnola, Lugano, Switzerland

Theorems and Conjectures

 * Ostrowski's Theorem
 * Ostrowski-Hadamard Gap Theorem (with Jacques Hadamard)
 * Ostrowski Numeration