title: Fundamental theory
text: # Fundamental theory
  
  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
  