On the completeness of some sets of functions

Of UPPSALA.' In the sequel we use S-L as an abbreviation of Sturm-Liouville.J G. BORG, Eine Umkehrung der Sturm-LiouviUeschen Eigenwertaufgabe, Acta math.78 (I945).~--, Inverse Problems in the theory of Characteristic Values of Differential Systems, Dixieme Congres des Math~maticiens Scandinaves, Copenhague I946.In these papers some results concerning eigenfunction-squares of regular S-L problems are contained.34-48173.~4cta mathematica.81.