Linear differential operators. Part II: Linear differential operators in Hilbert space. With additional material by the author. Translated by E. R. Dawson. English translation edited by W. N. Everitt. (English) Zbl 0227.34020

New York: Frederick Ungar Publishing Co. XV, 352 p. (1968).


34L99 Ordinary differential operators
34-01 Introductory exposition (textbooks, tutorial papers, etc.) pertaining to ordinary differential equations
34G10 Linear differential equations in abstract spaces


Zbl 0219.34001