IBM research Benoit Mandelbrot discovered fractals, or "fractal geometry"—a concept by which mankind could use mathematical properties to describe the rough, non-Euclidean geometrical irregularities that exist in nature.
Joseph Louis Lagrange - was an Italian Enlightenment Era mathematician and astronomer. He made significant contributions to the fields of analysis, number theory, and both classical and celestial mechanics.
Ő is Magyar! John von Neumann (Neumann János 1903 - was a Hungarian-American mathematician and polymath who made major contributions to a vast number of fields. He is generally regarded as one of the greatest mathematicians in modern history