1. 1896. Comptes Rendus, March M. Levavasseur gives an enumeration of these groups, without explaining how they were obtained, in His enumeration is not quite correct. He states that there are three groups which exist only whenp—1 is a multiple of 4 without being also a multiple of 8. We shall prove that there are only two such groups
2. Cayley. ‘American Journal of Mathematics’ Vol. i, 52–52. Every operation group of a given order may be represented by a regular substitution group of the same order.Cf.also Dyck,Mathematische Annalen, vol. xxii. p. 84