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  • 1
    Non-book medium
    Non-book medium
    Heidelberg [u.a.] : Spektrum Akad.-Verl.
    Call number: 19/NBM 01.0103
    Type of Medium: Non-book medium
    Pages: 1 CD-ROM + Booklet
    ISBN: 3827404436
    Classification:
    C.1.1.
    Location: Reading room
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Calcolo 37 (2000), S. 125-137 
    ISSN: 1126-5434
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract: In a recent series of papers (see Goldman [1–3]), B-splines of negative degree were introduced and partially investigated. The main purpose of the present paper is to continue and to extend these investigations. In the first part, we look more deeply onto the negative degree B-splines; we present an explicit representation for them, as well as a degree elevation formula; this solves a problem posed in [3]. Moreover, in the second part we look (probably for the first time in the literature) at the structure of the space of negative degree spline functions, spanned by the negative degree B-splines. As a main result here, we obtain a truncated power function representation of these splines.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Numerische Mathematik 55 (1989), S. 477-480 
    ISSN: 0945-3245
    Keywords: AMS(MOS):65B05 ; CR: G.1.D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary Extrapolation methods are well-known to be very efficient tools for the acceleration of the convergence of certain sequences of numbers or functions, cf. [2, 3, 4, 8, 9]. In this note we present a representation of linear extrapolation procedures in terms of complex contour integrals. For the proof we make use of a complete characterization of these procedures as linear functionals, which is itself of some interest and can be found, for example, in [2] or [8].
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Numerische Mathematik 59 (1991), S. 529-540 
    ISSN: 0945-3245
    Keywords: 65B05 ; 40A25
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary We analyze the convergence behavior of sequences of real numbers {x n }, which are defined through an iterative process of the formx n :=T(x n −1), whereT is a suitable real function. It will be proved that under certain mild assumptions onT, these numbersx n possess an asymptotic (error) expansion, where the type of this expansion depends on the derivative ofT in the limit point $$\xi : = \mathop {\lim }\limits_{n \to \infty } x_n $$ ; this generalizes a result of G. Meinardus [6]. It is well-known that the convergence of sequences, which possess an asymptotic expansion, can be accelerated significantly by application of a suitable extrapolation process. We introduce two types of such processes and study their main properties in some detail. In addition, we analyze practical aspects of the extrapolation and present the results of some numerical tests. As we shall see, even the convergence of Newton's method can be accelerated using the very simple linear extrapolation process.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Computing 50 (1993), S. 315-325 
    ISSN: 1436-5057
    Keywords: 65D05 ; 41A15 ; Spline interpolation ; Schoenberg-Whitney theorem ; multistep formula ; Newton-type interpolation formula
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Eines der fundamentalen Resultate in der Spline-Interpolations-Theorie ist der berühmte Satz von Schoenberg-Whitney, der eine vollständige Charakterisierung derjenigen Verteilungen von Punkten angibt, welche eindeutige Interpolation durch Splines zulassen. Allerdings gibt es bisher keinen iterativen Algorithmus zur expliziten Berechnung der interpolierenden Splinefunktion, und die einzig praktikable Methode zur Gewinnung dieser Funktion ist die explizite Lösung des zugehörigen linearen Gleichungssystems. In dieser Arbeit schlagen wir eine Methode vor, die auf iterative Weise die Koeffizienten des interpolierenden Splines in seiner B-Spline-Basis Darstellung berechnet. Die Startwerte unseres Einschritt-Iterationsverfahrens sind Quotienten zweier Determinanten von, im allgemeinen Fall, kleiner Reihenzahl, und in manchen Fällen sogar nur von zwei reellen Zahlen. Weiterhin geben wir eine Verallgemeinerung von Newton's Interpolationsformel für Polynome auf den Fall der Spline-Interpolation an, die einem Resultat von G. Mühlbach für den Haarschen Fall entspricht.
    Notes: Abstract One of the fundamental results in spline interpolation theory is the famous Schoenberg-Whitney Theorem, which completely characterizes those distributions of interpolation points which admit unique interpolation by splines. However, until now there exists no iterative algorithm for the explicit computation of the interpolating spline function, and the only practicable method to obtain this function is to solve explicitly the corresponding system of linear equations. In this paper we suggest a method which computes iteratively the coefficients of the interpolating function in its B-spline basis representation; the starting values of our one-step iteration scheme are quotients of two low order determinants in general, and sometimes even just of two real numbers. Furthermore, we present a generalization of Newton's interpolation formula for polynomials to the case of spline interpolation, which corresponds to a result of G. Mühlbach for Haar spaces.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Advances in computational mathematics 3 (1995), S. 89-100 
    ISSN: 1572-9044
    Keywords: B-splines ; recursion schemes ; knot insertion ; contour integral
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We present a unified approach to and a generalization of almost all known recursion schemes concerning B-spline functions. This includes formulas for the computation of a B-spline's values, its derivatives (ordinary and partial), and for a knot insertion method for B-spline curves. Furthermore, our generalization allows us to derive also some new relations for these purposes.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Numerical algorithms 7 (1994), S. 161-171 
    ISSN: 1572-9265
    Keywords: Divided differences ; asymptotic expansion ; numerical differentiation ; 65B05 ; 65D25 ; 41A60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract It is a well-known fact that the classical (i.e. polynomial) divided difference of orderm, when applied to a functiong, converges to themth-derivative of this function, if the evaluation points all collapse to a single one. In the first part of this paper we shall sharpen this result in the sense that we prove the existence of an asymptotic expansion with limitg (m) /m!. This result allows the application of extrapolation methods for the numerical differentiation of funtions. Moreover, in the second and main part of the paper we study generalized divided differences, which were introduced by Popoviciu [10] and further investigated for example by Karlin [2], Walz [15] and, mainly, Mühlbach [6–8]; we prove the existence of an asymptotic expansion also for these generalized divided differences, if the underlying function space is a Polya space. As a by-product, our results show that the generalized divided difference of orderm converges to the value of a certainmth order differential operator.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Numerical algorithms 16 (1997), S. 231-253 
    ISSN: 1572-9265
    Keywords: fractional order derivative ; fractional order differential equation ; quadrature ; extrapolation ; asymptotic expansion ; trapezoidal formula ; 26A33 ; 41A55 ; 65B05 ; 65L05 ; 65L06 ; 65D30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract We present an extrapolation type algorithm for the numerical solution of fractional order differential equations. It is based on the new result that the sequence of approximate solutions of these equations, computed by means of a recently published algorithm by Diethelm [6], possesses an asymptotic expansion with respect to the stepsize. From this we conclude that the application of extrapolation is justified, and we obtain a very efficient differential equation solver with practically no additional numerical costs. This is also illustrated by a number of numerical examples.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Chichester, West Sussex : Wiley-Blackwell
    Mathematical Methods in the Applied Sciences 11 (1989), S. 821-827 
    ISSN: 0170-4214
    Keywords: Mathematics and Statistics ; Applied Mathematics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics
    Notes: In the present paper we consider spline functions which are piecewise exponential sums of the form Σμ=1m αμeμx. Using the notation of Schumaker [10], we construct recursively computable B-splines of this space, where we make use of a complex contour integral.Furthermore, it is shown that this definition of a B-spline coincides in a certain sense with the ‘usual’ ones. which are based on the concept of generalized divided differences (e.g. [3, 12]).Finally, some additional properties of exponential B-splines are presented, including a differential relation.
    Type of Medium: Electronic Resource
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  • 10
    Publication Date: 2000-09-01
    Print ISSN: 0008-0624
    Electronic ISSN: 1126-5434
    Topics: Mathematics
    Published by Springer
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