Philip Edward Bertrand Jourdain (16 October 1879 – 1 October 1919) was a British logician and follower of Bertrand Russell

Bertrand Russell

Bertrand Arthur William Russell, 3rd Earl Russell, OM, FRS was a British philosopher, logician, mathematician, historian, and social critic. At various points in his life he considered himself a liberal, a socialist, and a pacifist, but he also admitted that he had never been any of these things...

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He was born in Ashbourne

Ashbourne, Derbyshire

Ashbourne is a small market town in the Derbyshire Dales, England. It has a population of 10,302.The town advertises itself as 'The Gateway to Dovedale'.- Local customs :...

 in Derbyshire one of a large family belonging to Emily Clay and his father Francis Jourdain (who was the vicar at Ashbourne). He was partly disabled by Friedreich's ataxia

Friedreich's ataxia

Friedreich's ataxia is an inherited disease that causes progressive damage to the nervous system, resulting in symptoms ranging from gait disturbance to speech problems; it can also lead to heart disease and diabetes....

. He corresponded with Georg Cantor

Georg Cantor

Georg Ferdinand Ludwig Philipp Cantor was a German mathematician, best known as the inventor of set theory, which has become a fundamental theory in mathematics. Cantor established the importance of one-to-one correspondence between the members of two sets, defined infinite and well-ordered sets,...

 and Gottlob Frege

Gottlob Frege

Friedrich Ludwig Gottlob Frege was a German mathematician, logician and philosopher. He is considered to be one of the founders of modern logic, and made major contributions to the foundations of mathematics. He is generally considered to be the father of analytic philosophy, for his writings on...

, and took a close interest in the paradoxes related to Russell's paradox

Russell's paradox

In the foundations of mathematics, Russell's paradox , discovered by Bertrand Russell in 1901, showed that the naive set theory created by Georg Cantor leads to a contradiction...

, formulating the card paradox

Card paradox

The card paradox is a non-self-referential variant of the liar paradox constructed by Philip Jourdain. It is also known as the postcard paradox, Jourdain paradox or Jourdain's paradox.- The paradox :...

 version of the liar paradox

Liar paradox

In philosophy and logic, the liar paradox or liar's paradox , is the statement "this sentence is false"...

. He also worked on algebraic logic

Algebraic logic

In mathematical logic, algebraic logic is the study of logic presented in an algebraic style.What is now usually called classical algebraic logic focuses on the identification and algebraic description of models appropriate for the study of various logics and connected problems...

, and the history of science with Isaac Newton

Isaac Newton

Sir Isaac Newton PRS was an English physicist, mathematician, astronomer, natural philosopher, alchemist, and theologian, who has been "considered by many to be the greatest and most influential scientist who ever lived."...

 as a particular study. He was London editor for The Monist

The Monist

The Monist: An International Quarterly Journal of General Philosophical Inquiry is an American academic journal in the field of philosophy. It was founded in October 1890 by Edward C. Hegeler, making it one of the longest-established journals in philosophy...

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His sister Eleanor Jourdain

Eleanor Jourdain

Eleanor Jourdain was an English academic and author, and Principal of St Hugh's College, Oxford, 1915 to 1924. She rose to fame following a claim that she and a fellow teacher had slipped back in time to the period of the French Revolution while on a trip to Versailles, known as the...

 was an English academic and author.

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