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asdf60
asdf60 is offline
#28
Dec15-05, 02:19 PM
P: 82
Hmmmm. What about this question.

Suppose a universe with exactly five elements. A set is definied by a formula A, and it turns out that the set has exactly 3 elements. Consider the set defined by -A (negation of A). Does this set have exactly 2 elements?