Philosophiæ Naturalis Principia Mathematica
work expounding Newton's laws of motion and his law of universal gravitation; in three books written in Latin, first published 5 July 1687.[2][3]
The Principia forms the foundation of classical mechanics. It is a derived form of Johannes Kepler's laws of planetary motion (which Kepler had first obtained empirically).
In formulating his physical theories, Newton developed and used mathematical methods now included in the field of calculus, expressing them in the form of geometric propositions about "vanishingly small" shapes.[10] In a revised conclusion to the Principia (see § General Scholium), Newton emphasized the empirical nature of the work with the expression Hypotheses non fingo ("I frame/feign no hypotheses").[11]