Look up fundamental in Wiktionary, the free dictionary.

Fundamental theory or Fundamental Theory may refer to:

• Philosophy, theology, and fundamental theory of Catholic canon law, the discipline of the philosophical and theological basis of Catholic canon law
• Fundamental theory (Eddington), Arthur Eddington's "Theory of Everything"
• Fundamental Theory, a 1948 posthumous book by Arthur Eddington

• Theory of everything, a hypothetical single, all-encompassing, coherent theoretical framework of physics

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