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His most significant early work was a three-volume attempt to derive all mathematical principles from a well-defined set of axioms and inference rules in symbolic logic, entitled ''Principia Mathematica'' (1910-1913).  He published this work with [[Alfred North Whitehead]]. Although the ''Principia'' is widely considered by one of the most important and seminal works in logic and philosophy, part of its success was in inspiring others to question its propositions. In 1931, [[Kurt Godel]] proved that what Russell attempted could not possibly be both consistent and complete.

His most significant early work was a three-volume attempt to derive all mathematical principles from a well-defined set of axioms and inference rules in symbolic logic, entitled ''Principia Mathematica'' (1910-1913).  He published this work with [[Alfred North Whitehead]]. Although the ''Principia'' is widely considered by one of the most important and seminal works in logic and philosophy, part of its success was in inspiring others to question its propositions. In 1931, [[Kurt Godel]] proved that what Russell attempted could not possibly be both consistent and complete.

During the [[Cold War]] he advocated nuclear disarmament, provoking controversy with the phrase "better Red than dead."

During the [[Cold War]] he advocated nuclear disarmament, even if it were unilateral on the part of Western powers, a stance which some people mocked as "better Red than dead".

A member of British nobility with the title of "Earl", Russell remained a hero to those on the political left, particularly in the English-speaking world, throughout his life.  In his 1929 book ''Marriage and Morals'', he argued that that sex between a man and woman who are not married to each other is not necessarily immoral if they truly love one another.  In the 1960's he became a vocal critic of the [[Vietnam War]].

A member of British nobility with the title of "Earl", Russell remained a hero to those on the political left, particularly in the English-speaking world, throughout his life.  In his 1929 book ''Marriage and Morals'', he argued that that sex between a man and woman who are not married to each other is not necessarily immoral if they truly love one another.  In the 1960's he became a vocal critic of the [[Vietnam War]].