Stefan E. Warschawski

Stefan Emanuel "Steve" Warschawski (April 18, 1904 – May 5, 1989) was a Russian-born American mathematician, a professor and department chair at the University of Minnesota and the founder of the mathematics department at the University of California, San Diego.

Early life and education Warschawski was born in Lida, now in Belarus; at the time of his birth Lida was part of the Russian Empire. the family spoke German at home. Warschawski stepped down as chair in 1967, Vernor Vinge is among Warschawski's doctoral students. it states that, if f is an analytic function on the open unit disk such that the real part of its first derivative is positive, then f is one-to-one.

In 1980, he solved the Visser–Ostrowski problem for derivatives of conformal mappings at the boundary.

Legacy Warschawski was honored in 1978 by the creation of the Stefan E. Warschawski Assistant Professorship at San Diego.