Petrović contributed significantly to the study of differential equations and phenomenology,[1] founded engineering mathematics in Serbia,[2] and invented one of the first prototypes of a hydraulic analog computer.Subsequently, in September 1889, he too went abroad, to Paris to receive further education, and to prepare for the entrance exam to the École Normale Supérieure.These expeditions included trips to Azores, Newfoundland and Labrador, Suez Canal, Madagascar, Cape Verde, Canary Islands, Greenland, Iceland, Bermuda Triangle, Caribbean and others.[5] He received numerous awards and acknowledgments and was a member of several foreign science academies (Prague, Bucharest, Warsaw, Kraków) and scientific societies.[1] Due to his scientific work and results, Mihailo Petrović Alas is among the greatest Serbian mathematicians as well as one of the 100 most prominent Serbs.In the Association for Culture, Art and International Cooperation "Adligat" in Belgrade there is an extensive fund of documents from the legacy of Mihailo Petrović Alas, including his childhood photos, letters from his grandfather who educated him, diplomas, notes, a whole bundle of published and unpublished manuscripts, as well as numerous exam reports signed by him, among which is the report on the defense of the graduation exam jointly signed by Mihailo Petrović and Milutin Milanković.