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Two thinkers, side by side

Life

Portrait of Gottlob Frege
Gottlob Frege

1848 CE – 1925 CE

AnalyticLogicianModernGerman

Born Wismar

He invented modern logic and analytic philosophy in a small German university town, and almost no one noticed for twenty years.

Portrait of Bertrand Russell
Bertrand Russell

1872 CE – 1970 CE

AnalyticModernBritish

He spent the first half of his career inventing analytic philosophy and the second half annoying governments. Both projects lasted.

Connection

Gottlob Frege built the logic Russell needed Bertrand Russell — Russell discovered Frege's Begriffsschrift in 1900 and recognized it as the most important work in logic since Aristotle. He then sent Frege the letter describing the paradox that broke the Basic Laws.

Shared Ideas

Reason

Ideas

ReasonLogos
ReasonEmpiricismOckham's Razor

Words

“Never let us take a description of the origin of an idea for a definition, or an account of the mental conditions on which we become conscious of a proposition for a proof of it.”

— Gottlob Frege

“The good life is one inspired by love and guided by knowledge.”

— Bertrand Russell

“Three passions, simple but overwhelmingly strong, have governed my life: the longing for love, the search for knowledge, and unbearable pity for the suffering of mankind.”

— Bertrand Russell

Key Moments

1874

Forty years at Jena

June 1902

Russell's paradox destroys the Basic Laws

1910-13

Principia Mathematica with Whitehead

1918

Imprisoned for anti-war activism

July 1955

Russell-Einstein Manifesto for nuclear disarmament

Works

The Foundations of Arithmetic

The Problems of Philosophy

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Volume I · Ancient Greece · 624-262 BCE