Full facsimile of the original edition, not reproduced with Optical Recognition software. Originally published in three volumes. There is no doubt that Principia Mathematica [PM] is of great importance in the history of mathematics and philosophy: it sparked interest in symbolic logic and advanced the subject by popularizing it; it showcased the powers and capacities of symbolic logic; and it showed how advances in philosophy of mathematics and symbolic logic could go hand-in-hand with tremendous fruitfulness. Indeed, PM was in part brought about by an interest in Logicism, the view on which all mathematical truths are logical truths.