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What is set theory? When there are five people in the room and seven are leaving, two have to enter the room, so it is empty.
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From: Dr. David Batchelor batchelor#NoSpam.nssdca.gsfc.nasa.gov:
Theorem: Consider the set of all sets that have never been considered.
Hey! They're all gone!! Oh, well, never mind...
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The world is divided into two classes:
people who say "The world is divided into two classes",
and people who say
The world is divided into two classes:
people who say: "The world is divided into two classes",
and people who say:
The world is divided into two classes:
people who say ...
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From: kfoster#NoSpam.rainbow.rmii.com (Kurt Foster) August 5 April 6 First mathemetician: I know this is a group, but it's hard to study. Second mathematician: Well, I can prove it's commutative. First mathematician: Thanks abelian!
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From: Zheng wang80#NoSpam.purdue.edu If the set of power stations forms a group under the operation of power generation, when isn’t it cyclic? When the generators are out of order. P.s. this one is original
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From: "Liflandsky Sergey" <riemann#NoSpam.bezeqint.net> Hi here is another joke I invented: Q: what is the opposite of Monday? A: Since the days of the week is a set of 7 elements, it is in the most natural way can be made into a group by definig an isomorphism between the set of the days of the week and Z (subscript) so we define f:days of the week---> Z 7 by f(Sunday)=1 f(Monday)=2, ....f(Saturday)=0. And by requiring f to be an isomorphism we define on the days of the week a structure of group, moreover since Z 7(+,0,1,*) is a field, we have that f is a field isomorphism so we easily see (Monday)^(-1)=Wednesday .
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