Synonym of remainder or the difference in the case of an arithmetic operation.

We say that

*a*≡*b*(mod*n*) if*a*−*b*is divisible by*n*. If*r*is the remainder of the division of*a*by*n*,*r*is called the residue*a*modulo*n*.Synonym of remainder or the difference in the case of an arithmetic operation.

We say that *a* ≡ *b* (mod *n*) if *a* − *b* is divisible by *n*. If *r* is the remainder of the division of *a* by *n*, *r* is called the residue *a* modulo *n*.