The value of 
,
where 
,
taken to be nonnegative and smaller than 
.
Common Residue
See also
Minimal Residue, ResidueExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Common Residue." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/CommonResidue.html