Mathematics Faculty Publications
Idempotents à la mod
Document Type
Article
Publication Date
11-2012
Disciplines
Higher Education | Science and Mathematics Education
Abstract
An idempotent satisfies the equation x2 = 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.
Recommended Citation
Sibley TQ. 2012. Idempotents à la mod. The College Mathematics Journal 43(5): 401-404.