Otto Szász (11 December 1884, Hungary â 19 December 1952, Cincinnati, Ohio) was a Hungarian mathematician who worked on real analysis, in particular on Fourier series. He proved the MüntzâÂÂSzász theorem and introduced the SzászâÂÂMirakyan operator. The Hungarian Mathematical and Physical Society awarded him the Julius Kà Ânig prize in 1939.