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Russell's Paradox (view source)

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[[Bertrand Russell]]'s Paradox reveals a flaw in the early or naive set theory.  (It is doubtful Bertrand Russell was the first to see this basic flaw.)
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[[Bertrand Russell]]'s Paradox revealed a flaw in 1901 in early or naive set theory.  (It is likely others saw this flaw before Bertrand Russell.)
    
The defect is as follows.  Let S be the set of all sets that do not contain  themselves as members.  In other words, set T is an element of S if, and only if, T is not an element of T:
 
The defect is as follows.  Let S be the set of all sets that do not contain  themselves as members.  In other words, set T is an element of S if, and only if, T is not an element of T:
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