Definition:Reduced Residue System/Least Positive Residue

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Definition

Let $\left[\!\left[{a}\right]\!\right]_m$ be the residue class of $a$ (modulo $m$).

If $r$ is the smallest non-negative integer in $\left[\!\left[{a}\right]\!\right]_m$, then $0 \le r < m$ and $a \equiv r \pmod m$ from Congruence to an Integer less than Modulus.

Then $r$ is called the least positive residue of $a$ (modulo $m$).

Also known as

Some sources call this the common residue.