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Walter Eberhard

University of Marburg

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Featured researches published by Walter Eberhard.

Mathematische Nachrichten | 2001

Indefinite Eigenvalue Problems with Several Singular Points and Turning Points

Walter Eberhard; Gerhard Freiling; Kerstin Wilcken-Stoeber

We consider a general class of eigenvalue problems with two-point boundary condi- tions on a finite interval generated by a differential equation with an indefinite weight function which has several zeros and/or poles. As a basic result we derive asymptotic estimates for a special funda- mental system of solutions of the corresponding differential equation and determine the asymptotic distribution of the eigenvalues. Finally we prove the uniformconvergence of eigenfunction expansions for some class of functions f .

Mathematische Nachrichten | 1994

Connection Formulas for Second Order Differential Equations with a Complex Parameter and Having an Arbitrary Number of Turning Points

Walter Eberhard; Gerhard Freiling; A. Schneider

Mathematische Zeitschrift | 1978

Stone-reguläre Eigenwertprobleme

Walter Eberhard; Gerhard Freiling

Mathematische Zeitschrift | 1973

Nicht-S-hermitesche Rand- und Eigenwertprobleme.

Walter Eberhard; Gerhard Freiling

Results in Mathematics | 1992

The distribution of the eigenvalues for second order eigenvalue problems in the presence of an arbitrary number of turning points

Walter Eberhard; Gerhard Freiling

Mathematische Zeitschrift | 1964

Das asymptotische Verhalten der Greenschen Funktion irregulrer Eigenwertprobleme mit zerfallenden Randbedingungen

Walter Eberhard

Differential and Integral Equations | 1990

On the distribution of the eigenvalues of a class of indefinite eigenvalue problems

Walter Eberhard; Gerhard Freiling; A. Schneider

Mathematische Zeitschrift | 1974

Das Verhalten der Greenschen Matrix und der Entwicklungen nach EigenfunktionenN-regulärer Eigenwertprobleme

Walter Eberhard; Gerhard Freiling

Mathematische Zeitschrift | 1965

Die Entwicklungen nach Eigenfunktionen irregulrer Eigenwertprobleme mit zerfallenden Randbedingungen. II

Walter Eberhard

Mathematische Nachrichten | 2000

On the Eigenvalues of Half-Linear Boundary Value Problems

Walter Eberhard; Árpád Elbert

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Gerhard Freiling

University of Duisburg

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A. Schneider

RWTH Aachen University

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Árpád Elbert

Hungarian Academy of Sciences

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Anton Zettl

Northern Illinois University

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