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| | Principia Mathematica |
 | | By using a notation superior in many ways to that of Frege, Whitehead and Russell managed to convey the remarkable expressive power of modern predicate logic in a way that previous writers had been unable to achieve. |
| | Second, by exhibiting so clearly the deductive power of the new logic, Whitehead and Russell were able to show how powerful the modern idea of a formal system could be, thus opening up new work in what was soon to be called metalogic. |
| | Third, Principia Mathematica reaffirmed clear and interesting connections between logicism and two main branches of traditional philosophy, namely metaphysics and epistemology, thus initiating new and interesting work in both these and other areas. |
| plato.stanford.edu /entries/principia-mathematica (1569 words) |
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