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Timo Reichert's user avatar
Timo Reichert's user avatar
Timo Reichert's user avatar
Timo Reichert
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For a finite set A of positive reals, prove that the set A + A - A contains at least as many positive as negative elements
May 23
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For a finite set A of positive integers, prove that the set A + A - A contains more positive than negative elements.

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