by Joseph A. Gallian
This article originally appeared in:
Mathematics Magazine
February, 2001
Subject classification(s):
Algebra and Number Theory | Abstract Algebra | GroupsApplicable Course(s):
4.2 Mod Algebra I & IIThe author gives a proof of the title as an application of Lagrange`s Theorem, allowing the theorem to be presented in the first semester of an undergraduate abstract algebra course.
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