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The Relation Between Mathematics and Physics by Paul Dirac

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The piece argues that physics advances by experiment and by mathematical reasoning, and that the surprising effectiveness of mathematics in describing nature reflects a deep mathematical constitution of the universe. The Newtonian mechanistic ideal emphasized simple equations, but relativity forced a shift: simplicity gives way to mathematical beauty, exemplified by replacing the Galilean group with the more elegant Lorentz group and by Einstein’s geometrical formulation of gravitation. Quantum theory further deepened the link by introducing non-commutative algebras for dynamical variables, bringing large swathes of pure mathematics into physics and highlighting transformations as more fundamental than equations.

It predicts a continuing unification of pure mathematics and fundamental physics and proposes a research method: choose branches of mathematics prized for beauty and rich transformation groups, develop them, and seek physical interpretation. Attempts based on less beautiful structures (e.g., non-associative algebras) failed, whereas functions of a complex variable look promising because their transformation group relates to the Lorentz group. The essay also challenges the idea that many particle properties are mere initial conditions, arguing for a broader mathematical determination of such constants and for the eventual application of most, if not all, pure mathematics to physical law.

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