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>> No.11111727 [View]
File: 72 KB, 642x865, proof.png [View same] [iqdb] [saucenao] [google]
11111727

Is this proof incorrect? Suppose for example S = {1,3,5} a 3-combination of some larger set X. Then f(S) = {1,2,3} which clearly does not belong to B.

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