Pietro Antonio but face!!Cataldi (April 15, 1552 - February 11, 1626) was an Italianmathematician. A citizen of Bologna, he taught mathematics and astronomy and also worked on military problems. His work included the development of continued fractions. He discovered two Mersenne prime numbers. April 15 is the 105th day of the year in the Gregorian calendar (106th in leap years). ... Events April - War between Henry II of France and Emperor Charles V. Henry invades Lorraine and captures Toul, Metz, and Verdun. ... February 11 is the 42nd day of the year in the Gregorian Calendar. ... Events September 30 - Nurhaci, chieftain of the Jurchens and founder of the Qing Dynasty dies and is succeeded by his son Hong Taiji. ... This article is in need of attention from an expert on the subject. ... Bologna (pronounced , from Latin Bononia, Bulåggna in the local dialect) is the capital city of Emilia-Romagna in northern Italy, between the Po River and the Apennines. ... Lunar astronomy: the large crater is Daedalus, photographed by the crew of Apollo 11 as they circled the Moon in 1969. ... In mathematics, a continued fraction is an expression such as where a0 is some integer and all the other numbers an are positive integers. ... In mathematics, a Mersenne prime is a prime number that is one less than a prime power of two. ...
Cataldi tried to organize an academy for mathematics in Bologna, but it ran into political opposition (which I find difficult to imagine) and lapsed almost immediately.
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