Szolem Mandelbrojt

Mandelbrojt, a Polish-French Jewish mathematician (uncle of the fractal pioneer Benoit Mandelbrot), specialized in mathematical analysis, particularly the theory of lacunary series, Dirichlet series, and Taylor series with gaps. A member of the Bourbaki group in its early years, he held a chair at the Collège de France in Paris for decades. His work deepened understanding of how the coefficients of a series control the behavior of the function it defines.