A result that has been proved to be true (using facts that were already known). Example: The "Pythagoras Theorem" proved that for a right angled triangle a ^{2} + b^{2} = c^{2}A Theorem is a major result (if it is just a minor result it is called a "Lemma") Other examples: • Intermediate Value Theorem • Binomial Theorem • Fundamental Theorem of Arithmetic • Fundamental Theorem of Algebra Lots more! See: Pythagoras Theorem |