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Philosophiæ Naturalis Principia Mathematica ("Mathematical Principles of Natural Philosophy") by Isaac Newton, often referred to as simply the Principia (), is a work in three books written in Latin, first published 5 July 1687. After annotating and correcting his personal copy of the first edition, Newton published two further editions, during 1713 with errors of the 1687 corrected, and an improved version of 1726.