# Category:Examples of Euler Phi Function

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This category contains examples of Euler Phi Function.

Let $n \in \Z_{>0}$, that is, a strictly positive integer.

The **Euler $\phi$ (phi) function** is the arithmetic function $\phi: \Z_{>0} \to \Z_{>0}$ defined as:

- $\map \phi n = $ the number of strictly positive integers less than or equal to $n$ which are prime to $n$

That is:

- $\map \phi n = \card {S_n}: S_n = \set {k: 1 \le k \le n, k \perp n}$

## Subcategories

This category has only the following subcategory.

### E

## Pages in category "Examples of Euler Phi Function"

The following 9 pages are in this category, out of 9 total.