1. The notation and the elements of the theory of matrices used in the present paper may be found in Schlesinger,Vorlesungen über lineare Differentialgleichungen, p. 18?19.
2. Trans. Am. Math. Soc. 10 (1909), p. 436?470; in particular see p. 438?443.
3. Acta Math. 27 (1903), p. 365?390.
4. Cf. Hensel und Landsberg, Theorie der algebraischen Funktionen einer Variabeln, p. 158?173.