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Idempotents à la mod

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An idempotent satisfies the equation x 2 = x. In ordinary arithmetic, this is so easy to solve it's boring. We delight the mathematical palette here, topping idempotents off with modular arithmetic and a series of exercises determining for which n there are more than two idempotents (mod n) and exactly how many there are.
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Document Type: Research Article

Publication date: 01 November 2012

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