| 11. | Imagine that this torus represents the " spacetime " for a physical theory.
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| 12. | This makes QED one of the most accurate physical theories constructed thus far.
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| 13. | These "'physical theories modified by general relativity "'are described below.
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| 14. | Compactification is one way of modifying the number of dimensions in a physical theory.
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| 15. | And other physical theories like the theory or relativity in the case of physics?
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| 16. | Important symmetries in physics include internal symmetries of particles; and supersymmetry of physical theories.
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| 17. | One of the youngest physical theories, string theory, is also very geometric in flavour.
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| 18. | The nonlinearity of the EFE distinguishes general relativity from many other fundamental physical theories.
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| 19. | John Earman has argued that most physical theories are indeterministic.
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| 20. | An example of a physical theory that takes a deliberately macroscopic viewpoint is thermodynamics.
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