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Isaac newton worked on "Principia Mathematica" for approximately two years, from 1685 to 1687. This work laid the foundation for classical mechanics and the laws of motion.
Sir Isaac Newton's book "Philosophiæ Naturalis Principia Mathematica" (Mathematical Principles of Natural Philosophy) was published by the Royal Society in 1687.
Philosophiæ Naturalis Principia Mathematica, Latin for "Mathematical Principles of Natural Philosophy", often called the Principia ("Principles"), is a work in three books by Sir Isaac Newton, first published July 5 1687.
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Principia mathematica