For 10 points, name this collaborator with Alfred North Whitehead on the Principia Mathematica.
The major modern biography of this man is by Ray Monk and divided into "The Spirit of Solitude" and "The Ghost of Madness." His first book dealt with German social democracy, and he went on to write such works as The Analysis of Mind, Marriage and Morals, and Why I Am Not a Christian. He collaborated on a three-volume work whose basic assumption was overturned by Gödel's incompleteness theorem. For 10 points, name this collaborator with Alfred North Whitehead on the Principia Mathematica.
The major modern biography of this man is by Ray Monk and divided into "The Spirit of Solitude" and "The Ghost of Madness."
Bertrand {Russell}