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Developed they pythagorean theorem.
A^2 + B^2 = C^2 -
He introduced the decimal system and the Fibonacci sequence (1,1,2,3,5,8,13...).
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Descartes established the Cartesian plane.
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He invented one of hte first mechanical calculators. He developed Pascal's triangle.
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He found that every prime number must satisfy, namely 2^(2n) + I = a prime.
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Four of the most important constant symbols in mathematics (π, e, i = √-1, and γ = 0.57721566...) were all introduced or popularized by Euler.
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He determined of the law of quadratic reciprocity.
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