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Euclid of Alexandria, was a Greek mathematician, often referred to as the "Father of Geometry".
His Elements is one of the most influential works in the history of mathematics, serving as the main textbook for teaching mathematics. In the Elements, Euclid deduced the principles of what is now called Euclidean geometry from a small set of axioms. Euclid also wrote works on perspective, conic sections, spherical geometry, number theory and rigor