Notations and jwoperties.The matrices which form the subject of the present communication have been considered* from the point of view of determinants by Cauchy, Schlafli, Sylvester, Zehfuss, and various later writers, and from the point of view of matrices, their latent roots being in question, by Rados, Franklin, Metzler, Stephanos, Burnside, and others. Our present object is to go beyond this and to investigate the elementary divisors of the characteristic determinants of the matrices, which specify completely their invariance under transformations of the type HAH~X, in brief, to obtain the classical canonical form of the matrices.The matrices which we shall consider are related either to a single generating matrix A = [a (j ], in some prescribed field and of given canonical form, or else to a set of such matrices A it j -1, 2, ..., m, not necessarily all of the same order. Interest in anj^ matrix will centre throughout upon its classical canonical form C = HAH-1 , \H\ =£ 0, and it will be convenient to represent this by the various notations, e.g.
C == diag[C 3 (A 1 ), C 2 (A 2 ), C 1 (A 3 )]A list of references is given at the end of this paper. 1933.] COMPOUND AND INDUCED MATRICES. 355 x (0 = { x u> X 2i> • • • > x n) (* = 1, 2, ..., m), let the m-th compound be constructed, namely X m = {| # 1 1 # 2 2 ••• x m m » •••> x r -m + l > r -m + 1 ••• x r r \ } -