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Mihailo Petrović Alas, born in 1868, was an influential Serbian mathematician. He was also a distinguished professor at Belgrade University, an academic, fisherman, writer, publicist, musician, businessman, traveler and volunteer in the Balkan Wars and the First World War.
He finished the First Belgrade Gymnasium in 1885, and enrolled at the natural science-mathematical section of the Faculty of Philosophy in Belgrade. In September 1889, he went to Paris to receive further education. He got a degree in mathematical sciences from Sorbonne University in 1891. His doctorate was in the field of differential equations. In 1894, Petrović became a professor of mathematics at the Belgrade's Grande école (which later became the University of Belgrade) and held lectures until his retirement in 1938.
In 1882, he became a fisherman apprentice, and in 1895 he took an exam to become a master fisherman. Mihailo Petrović got the nickname "Alas" (river fisher) because of his passion for fishery. He was not only an aficionado, but expert as well. He participated in legislative talks regarding the fishery convention with Romania, and in talks with Austria-Hungary about the protection of the fishery on Sava, Drina and Danube rivers.
Alas' passion for fishing eventually grew into a specific worldview, and became a distinctive, practiced and defined “philosophy of life". Standing out in his literary writings is his most detailed and most famous popular science novel - "The Eel Novel" that offers the reading public a retrospective of the solutions proposed to the two-millennium-old eel mystery in a lucid, accessible manner.
He played violin, and in 1896, founded a musical society named Suz.
When the Second World War broke out in Yugoslavia, the Germans captured him. After a while, he was released because of illness. On 8 June 1943, professor Petrović died in his home in Kosančićev Venac Street in Belgrade.