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The Cartesian coordinate plane was first seen in Descartes' La Géométrie in 1637. It is said that Descartes came up with the idea after laying in bed and seeing a fly on the ceiling. He notices that he could represent the fly's location on the ceiling by using two numbers, x and y, to indicate the fly's position on the ceiling.
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Credited along with Sir Isaac Newton, Gottfried Wilhelm Leibniz invented Calculus.
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Casio Japan invented the graphing calculator, the Casio FX-7000, in 1985. The lead engineer on the Casio 7000 development team was Hideshi Fukaya.
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Sometimes called the "Father of Algebra." Diophantus lived in Alexandria, Egypt and made great strides toward understanding Algebra.
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Muhammad ibn Mūsā al-Khwārizmī (c. 780–850) wrote The Compendious Book on Calculation by Completion and Balancing, which established algebra as a mathematical discipline that is independent of geometry and arithmetic.
