Russell's paradox

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What Wikipedia says

In mathematical logic, Russell's paradox (also known as Russell's antinomy) is a set-theoretic paradox published by the British philosopher and mathematician, Bertrand Russell, in 1901. Russell's paradox shows that every set theory that contains an unrestricted comprehension principle leads to contradictions.

Excerpt from the Wikipedia article “Russell's paradox”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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