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Introduction to Mathematical Philosophy is a book by Bertrand Russell, published in 1919, written in part to exposit in a less technical way the main ideas of his and Whitehead's Principia Mathematica, including the theory of descriptions. Mathematics and logic, historically speaking, have been entirely distinct …

In Praise of Idleness and Other Essays is a collection of essays by Bertrand Russell published in 1935. The collection includes essays on the subjects of sociology, philosophy, and economics. In the eponymous essay, Russell argues that if everyone worked only four hours per day, unemployment would decrease and human …