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Euclid of Alexandria
Some time between 300 bc and 200 bc, Euclid of Alexandria collated and unified geometry. Many of Euclid's theorems were originated by earlier mathematicians, but Euclid showed how they formed a comprehensive and logical system.
His book "Elements" is one of the most influential texts in history, both for the method and the mathematics. It included both plane and solid geometry. From this the concept of Euclidean space is derived.
Further information on Euclidean geometry may be found here.
Further information on Euclid's life and works may be found here.
