WordReference Random House Unabridged Dictionary of American English © 2025
num′ber the′ory, [Math.]
  1. Mathematicsthe study of integers and their relation to one another. Also called theory of numbers. 
  • 1910–15

Collins Concise English Dictionary © HarperCollins Publishers::
number theory
  1. the study of integers, their properties, and the relationship between integers
'number theory' also found in these entries (note: many are not synonyms or translations):
Diophantine equation - Dirichlet - higher mathematics - theory - theory of numbers

Forum discussions with the word(s) "number theory" in the title:


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