In this note, Principia Mathematica refers to Newton's *Philosophiae Naturalis Principia Mathematica* (1687), a foundational work in classical mechanics.

This is where Newton formalized laws of motion and universal gravitation that dominated physics for centuries.

Later physics ([[Special Relativity]] and [[General Relativity]]) revised the picture, but Principia is still a landmark.

## See also
- [[Isaac Newton]]
- [[General Relativity]]
- [[Special Relativity]]