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Russell's paradox. http://en.wikipedia.org/wiki/Russell's_paradox http://en.wikipedia.org/wiki/Russell's_paradox

• imgabe 19y ago
  Mine too! It's also the inspiration for my favorite math joke: Consider the set of all sets that have never been considered...Wait, nevermind, they're gone!
  • jsmcgd 19y ago
    Mine too too. It makes logic not look so logical anymore.