About Mihailo 'Alas' Petrović
Mihailo Petrović Alas (Serbian Cyrillic: Михаило Петровић Алас; 6 May 1868 – 8 June 1943), was an influential Serbian mathematician and inventor. He was also a distinguished professor at Belgrade University, an academic, fisherman, writer, publicist, musician, businessman, traveler and volunteer in the First and Second World Wars. He was a student of Henri Poincaré, Charles Hermite and Charles Émile Picard. Petrović contributed significantly to the study of differential equations and phenomenology[clarification needed], as well as inventing one of the first prototypes of an analog computer.