Introduction to Mathematical Philosophy is a book that was written by Bertrand Russell and published in 1919. The focus of the book is on the theory of description and it presents the ideas found in Principia Mathematica in an easier way to understand.Bertrand Russell was a British philosopher, logician, and mathematician. Russell was one of the leaders in the British "revolt against idealism" and he is credited for being one of the founders of analytic philosophy. In 1950 Russell received the Nobel Prize in Literature.