Under modulo n, the numbers 0, 1, 2, ..., n-1 make up a residue class. For example, under modulo 5, the residue class is {0, 1, 2, 3, 4}.
Under modulo n, the numbers 0, 1, 2, ..., n-1 make up a residue class. For example, under modulo 5, the residue class is {0, 1, 2, 3, 4}.