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Figure out what f is

Name: Anonymous 2007-11-28 9:41

f({1 2 3 4}) = {{1 2} {1 2 3} {1 2 3 4} {1 3} {1 3 4} {1 4} {2 3} {2 3 4} {2 4} {3 4}}

Good luck.

Name: Anonymous 2007-11-28 9:54

f(x) is the set of all subsets of the set x with two or more elements

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