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Questions about the branch of algebra that deals with cyclic groups.

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The number of elements with order less than $k$ in a larger cyclic group

I am working on a problem where it has become important to count (or at least bound from above and below) the number of elements of ${\bf Z}/n{\bf Z}$ that have order less than a given $k$, where $2\l …
Marcel K. Goh's user avatar