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Journal of Applied Logic
Volume 3, Issue 1, March 2005, Pages 15-41
URLﾘﾝｸ(www.sciencedirect.com)
The most popular of those is the so-called Russell set, R := {x|not x∈x}, for by the law of
excluded middle one immediately gets ‘R∈R∧not R∈R’, an apparent contradiction.