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High Quality Content by WIKIPEDIA articles! Hero (or Heron) of Alexandria(c. 10?70 AD). was an ancient Greek mathematician who was a resident of a Roman province (Ptolemaic Egypt); he was also an engineer who was active in his native city of Alexandria. He is considered the greatest experimenter of antiquity and his work is representative of the Hellenistic scientific tradition. Hero published a well recognized description of a steam-powered device called an aeolipile (hence sometimes called a "Hero engine"). Among his most famous inventions was a windwheel, constituting one of the earliest instances of wind harnessing. He is said to have been a follower of the Atomists. Some of his ideas were derived from the works of Ctesibius. Much of Hero's original writings and designs have been lost, having been burned by anti-pagan Christians sometime in the late 4th to 5th century?whether intentionally or unintentionally, as many of the writings from the Library of Alexandria were housed in pagan temples later burned by Christian leaders such as Pope Theophilus of Alexandria. Fortunately, some of his works were preserved in Arab manuscripts. ... Read more

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Euclidean Geometry, Euclid's Elements, ParallelPostulate,Non-Euclidean Geometry, Elliptic Geometry, AffineGeometry,Ordered Geometry, Congruence (geometry), Interferometry,Appollonius of Perga, Axiomatic System, List ofInteractivegeometry software, Error detection and correction,CartesianCoordinate System, Compass and straightedge construction,Optics, Theorem, Dimension, Line segment, Degree (angle),Radian, Reduction ad absurdum and Theodolite ... Read more

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Greek letters are used in mathematics, science, engineering,and other areas where mathematical notation is used assymbols for constants, special functions, and alsoconventionally for variables representing certainquantities. In these contexts, the capital letters and thesmall letters represent distinct and unrelated entities.Those Greek letters which have the same form as Latinletters are usually not used: capital A, B, E, H, I, K, M,N, O, P, T, X, Y, Z. Small are also rarely used, since theyclosely resemble the Latin letters i, o and u. Sometimesfont variants of Greek letters are used as distinct symbolsin mathematics, in particular for phi and pi.In mathematicalfinance, The Greeks are the variables denoted by Greekletters used to describe the risk of certaininvestments.English-speaking mathematicians use neither themodern nor the historical Greek pronunciations of the namesof the letters, but the traditional English pronunciation, ancient and modern. ... Read more