Group Properties of the Residue Classes of Certain Kronecker Modular Systems and Some Related Generalizations in Number Theory

Among other things he has shown that whenever this happens all the residue
classes of ( ^ , p ) , excepting the one containing ... 269, vol. 32 (1846), p. 93.
Dedekind, Crelle's Journal, vol. 54 (1857), pp. 1-13. Cauchy, Exercices d'analyse
et de ...