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...arly or naive [[set theory]]. (It is likely others saw this flaw before [[Bertrand Russell]].) It is a form of the [[liar's paradox]] expressed in the terms o Russel's paradox and others like it can be avoided only at the expense of giving u

[[File:Bertrand Russell transparent bg.png|thumbnail|right|200px|[[Bertrand Russell]] ]] ...] Most online sources say "by which one prove," probably a mistake.</ref> Bertrand Russell wrote in 1903 about [[entropy]] and the universe:

...nother, more "flexible" belief system.{{#tag:ref|cf. ''"[[Bertrand Russell|Russel]], in particular, was so found of tergiversation that another celebrated Br