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theory 
  n 
  (set of ideas explaining something)  théorie  f  
→ the theory of relativity   
Darwin's theory of evolution  la théorie de l'évolution de Darwin 
  (=hypothesis) théorie  f  
I have a theory that ...  ma théorie, c'est que ... 
there was a theory that ...  on croyait que ... 
→ There was a theory that he wanted to marry her   
  (rules and principles forming basis of subject)  théorie  f  
music theory  solfège  m  
 in theory   (=theoretically) théoriquement 
→ a presidency that is strong in theory but weak in practice   

big bang theory , Big Bang theory 
  n théorie  f  du big bang 
chaos theory 
  n théorie  f  du chaos 
conspiracy theory 
  n thèse  f  du complot 
→ Did you ever swallow the conspiracy theory about Kennedy?   
games theory 
  n théorie  f  des jeux 
→ He won the Nobel prize for making game theory relevant to modern economics,   
probability theory 
  n théorie  f  des probabilités



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