Abstract:O, Baze~. 0bet 0~itla~ionstheoreme. 6~ 0ber eine Methode zum Beweise yon 0szillations~eoremen. Von OTTo HAuPT in Karlsruhe i/B. EinIeitung. Is~ eine gew~hnliche Differen~ialgleichung gegeb~n~ we!~he einen Parameter enth~l~, uncl schreibt m~ ffir die L6sungen in den Endptulk~en eines Intervalls a~ b Bedingungen vor~ die nur f~r gewisse~ die sogenaunten ausge~neten Werte des t~ar~ er~llt werden kSnnen, so wird bierdutch eine l~andwertaufgabe definiert. Wit nehmen an, es exist~exea ausgezeichnete Parameierwerte, … Show more
“…The following result due to Liapunov [7] and Haupt [4,5] connects the problem of the determination of those values of 2 for which solutions of (1) are stable to the problem of determining those values of 2 for which equation (1) has a solution of period ~ or 2n:…”
“…The following result due to Liapunov [7] and Haupt [4,5] connects the problem of the determination of those values of 2 for which solutions of (1) are stable to the problem of determining those values of 2 for which equation (1) has a solution of period ~ or 2n:…”
“…The spectral properties of such differential operators have attracted interest for more than a century, see [8,11]. For an overview we refer to [13] and for recent results on the non-real spectrum see [2][3][4][5][6][7]10].…”
A simple explicit bound on the absolute values of the non-real eigenvalues of a singular indefinite Sturm-Liouville operator on the real line with the weight function sgn(·) and an integrable, continuous potential q is obtained.
“…If q(t) changes sign on [0, b] we call the problem (1.1), (1.2) indefinite. This case was considered by Hilb [12], Haupt [11] and Richardson [16] who proved theorems on the oscillation of the solutions and generalized some parts of the theory of definite problems to indefinite ones.…”
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