Theoretical physics
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Theoretical physics is a branch of physics that uses mathematical models and abstractions of physical objects and systems to explain and predict natural phenomena. It is, in the broadest sense, the at
Visual representation of a Schwarzschild wormhole. Wormholes have never been observed, but they are predicted by mathematical models in general relativity.
The title page of the second edition (1713) of Newton's Philosophiae Naturalis Principia Mathematica. The first edition appeared in 1687 and is widely regarded as the founding document of theoretical physics in the modern sense.
Mathematical physics
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Mathematical physics is the development of mathematical methods for use in physics and their applications. A broader definition would include the development of mathematical ideas inspired by physics,
Kepler's three laws of orbital motion