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Little is known about Euclid, fl. 300BC, the author of The Elements. He taught and wrote at the Museum and Library at Alexandria, which was founded by Ptolemy I. Almost everything about him comes from Proclus' Commentary, 4th cent AD.
Euclid's Elements. The Elements (Ancient Greek: ÏÏÎ¿Î¹ÏÎµá¿Î± Stoicheia) is a mathematical treatise consisting of 13 books attributed to the ancient Greek mathematician Euclid in Alexandria, Ptolemaic Egypt circa 300 BC. It is a collection of definitions, postulates, propositions (theorems and constructions), and mathematical proofs of the propositions.