The Deficiency Index Problem for Powers of Ordinary Differential Expressions (Lecture Notes in Mathematics, 621)

Pbk, 112 p. Previous owner's name on t.p. as well as some very light foxing o/w a clean unmarked copy in very good condition. Contents : Functional analytic preliminaries -- Linear differential operators and the general classification theory of deficiency indices -- Second order limit-point, limit-circle conditions -- Higher order limit-point criteria -- The deficiency index problem for polynomials in symmetric differential expressions -- Applications of perturbation theory -- Conditions on the coefficients for all powers to be limit-point. [Boundary value problems Weyl theory - Differential operators] w63 / m16568.