Columbia subject headings:
Harvard subject headings:
Algebras, Linear.
Nevanlinna, Rolf, 1895-1980.
Operator theory.
Schur, Issai, 1875-1941.
Princeton subject headings:
Algebra, Linear.
Nevanlinna, Rolf, 1895-1980.
Operator theory.
Schur, Issai, 1875-1941.