Q: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
This philosopher discussed the philosophy of science in Our Knowledge of the External World as a Field for Scientific Method in Philosophy. He coined the term logical atomism in a 1911 paper, and in The Ethics of War, he defended wars of principle and wars of colonization. He criticized Alexius Meinong in his essay On Denoting. His other works include a History of Western Philosophy and the essay Why I Am Not a Christian. His namesake paradox debunked the nave set theory of Gottlob Frege. For 10 points, name this philosopher who, with Alfred North Whitehead, wrote Principia Mathematica.
A:
Social Science