Swanson, Charles Andrew (1957) Asymptotic expansions for characterization values and functions of a second order ordinary linear differential operator. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-08062004-144733
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Consider a second order ordinary linear differential operator on a real half-open interval (0,b] (b > 0) which contains no singular points. Suppose x = 0 is a singular point. The basic characteristic value problem is defined on this interval when suitable boundary conditions are adjoined at the endpoints. Two classes of perturbed characteristic value problems are defined on subintervals [a,b], where a is a small positive number. It is proved under certain conditions on the basic problem that for each isolated characteristic value [...] of the basic problem there is a characteristic value [...] of the perturbed problem which is developable in an asymptotic expansion with leading term [...] valid as [...]. Furthermore, the characteristic function corresponding to [...] possesses an asymptotic expansion valid as [...] uniformly in the interval [a,b]. These expansions are not asymptotic power series, but are asymptotic expansions of a more general type.
|Item Type:||Thesis (Dissertation (Ph.D.))|
|Degree Grantor:||California Institute of Technology|
|Division:||Physics, Mathematics and Astronomy|
|Thesis Availability:||Public (worldwide access)|
|Defense Date:||1 January 1957|
|Default Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Imported from ETD-db|
|Deposited On:||09 Aug 2004|
|Last Modified:||26 Dec 2012 02:56|
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