Luca Pacioli (1445-1517) was an Italian monk and mathematician who in 1494 published an encyclopedic compendium of all that was known in the field of mathematics at the time: Summa de arithmetica, geometria,proportioni et proportionalita. This Italian stamp commemorates the 500th anniversary of this event with a painting based undoubtedly on an original by Jacopo de Barbari of Pacioli surrounded by mathematical figures and artifacts. His work contained many chapters on double entry bookkeeping based on an unpublished manuscript of Benedetto Cotrugli, and elsewhere he drew on the work of many earlier mathematicians, including Fibonacci. His last great work was Divina proportione, (divine proportion, a term coined by Pacioli) or the golden section, known to Greek mathematicians and philosophers. This work was illustrated by his friend Leonardo da Vinci.
Known by his Pascal triangle, which was already known 100 years before to Apianus, and his contribution to the development of probability theory.
Stamp: France 1962
PETR, Karel (1868-1950) Czech mathematician, educator, author - Czechoslovakia 1100
Born: 18 Jan 1901 in Sevsk, Orlov guberniya, Russia
Died: 15 Jan 1973 in Moscow, USSR
Russian educator, author, journalist, mathematician - Russia 4154
Born: 427 BC in Athens, Greece
Died: 347 BC in Athens, Greece
Mihajlo Idvorski Pupin (1854 October 9 - March 12, 1935) (A.k.a "Michael I. Pupin") Serbian-American physicist who devised a means of greatly extending the range of long-distance telephone communication by placing loading coils (of wire) at predetermined intervals along the transmitting wire (this research was done initially by Oliver Heaviside). Born in the village Idvor near Pančevo, Banat, Austria-Hungary (now Serbia and Montenegro), Pupin emigrated to U.S. as a 16 year old and graduated with honors in 1883 at Columbia College, New York. Having obtained his Ph.D. at the University of Berlin in 1889, Pupin returned to Columbia University to become a teacher of mathematical physics. Pupin's research pioneered carrier wave detection and current analysis. His 1894 invention, now known as "Pupin coil", extended the range of long-distance telephones. In 1896 he developed a method of rapid x-ray photography, requiring an exposure of only a fraction of a second, rather than that of an hour or more. In 1901, he became a professor and, in 1931, a professor emeritus of Columbia University.
In 1911 Pupin became a consul of Kingdom of Serbia in New York. In his speech to Congress on January 8, 1918, known as the Fourteen Points speech, U.S. president Woodrow Wilson, inspired by his conversations with Pupin, insisted on the restoration of Serbia and Montenegro, as well as autonomy for the peoples of the Austro-Hungarian monarchy.
Michael Pupin's autobiography, "From Immigrant to Inventor", won the Pulitzer Prize in 1924. He also wrote "The New Reformation" (1927) and "Romance of the Machine" (1930), as well as many technical papers.
Pupin was also active with the Serb émigré societies in the USA, he was the first president and founder of the Serb National Shield Society.
Born: about 569 BC in Samos, Ionia
Died: about 475 BC
Pythagoras the Superstar
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