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Fabrizio Mordente
Fabrizio Mordente (Salerno, 1532 – ca 1608) was an Italian mathematician. He is best known for his invention of the "proportional eight-pointed compass" which has two arms with cursors that allow the solution of problems in measuring the circumference, area and angles of a circle. In 1567 he published a single sheet treatise in Venice showing illustrations of his device.
==Life and career==
Fabrizio Mordente was born in Salerno, Italy, and studied at the Università di Napoli. After completing his studies at the age of 20, he set out to see the world. He left Naples in 1552 and visited Crete, Cyprus, Egypt, Palestine and Mesopotamia. After reaching the Persian Gulf, he took a Portuguese ship to India. He stayed in Goa for three years and then continued his voyage around the Cape of Good Hope, eventually arriving in Lisbon. He went from there to Paris and visited other European cities before returning to Italy and visiting Venice, Florence and Rome. During this trip he drafted the initial design for his compass.
Based on the success of his design, Mordente took service in 1571 at the court of Emperor Maximilian II in Vienna. From 1578 he served in Prague at the court of Rudolph II, to whom he dedicated an edition of ''Anversa'' in 1584. In Prague, he also met Michiel Coignet and Giordano Bruno, who used the compass to refute Aristotle's hypothesis on the incommensurability of infinitesimals, thus confirming the existence of the "minimum" which was the basis of his atomic theory. Bruno published the dialogues ''Mordentius'' and ''De Mordentii circino'' which praised Mordente, but also presented criticisms that raised protests from the mathematician. Mordente replied in 1586 and Bruno responded with the satires ''Idiota triumphans'' and ''De somnii interpretatione.'' After Mordente gained support in the dispute from the French Charles, Duke of Guise, Bruno was forced to flee Paris.
After this controversy, Mordente took service with the Duke of Guise until his death. In 1591 Mordente returned to Italy and entered the service of Alexander Farnese, Duke of Parma, where he published his last mathematical treatise.
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