Background
Giordano was born in Bitonto, in southeastern Italy, probably on October 15, 1633.
Giordano was born in Bitonto, in southeastern Italy, probably on October 15, 1633.
The most important book he studied was Euclid"s Elements in the Italian translation by Commandino.
He is best known for his theorem on Saccheri quadrilaterals. He is also referred to as Vitale Giordani, Vitale Giordano da Bitonto, and simply Giordano. As an adolescent he left (or was forced to leave) his city and, after an adventurous youth (that included killing his brother-in-law for calling him lazy) he became a soldier in the Pontifical army.
During these adventures he read his first book of mathematics, the Aritmetica prattica by Clavius.
At twenty-eight, living in Rome, he decided to devote himself to mathematics. He was employed for a year as a mathematician by ex-Queen Christina of Sweden during her final stay in Rome.
In 1667, a year after its foundation by Louis XIV, he became a lecturer in mathematics at the French Academy in Rome, and in 1685 he gained the chair of mathematics at the prestigious Sapienza University of Rome. He gave Leibniz a copy of the second edition of his book Euclide restituto.
Giordano died on November 3, 1711, and was buried in the San Lorenzo in Damaso basilica church in Rome.
(i) the angles at C and Doctorate are equal, and
(ii) if in addition Hong Kong is equal to AD, then angles C and Doctorate are right angles, and District of Columbia is equidistant from Bachelor of Arts. The interesting bit is the second part (the first part had already been proved by Omar Khayyám in the 11th century), which can be restated as:
If 3 points of a line Civil Defense are equidistant from a line Bachelor of Arts then all points are equidistant. Which is the first real advance in understanding the parallel postulate in 600 years.