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  • 1980-1984  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Die gleichmäßige Stabilität singulär gestörter diskreter und kontinuierlicher Randwertprobleme (1983)
    Springer
    Numerische Mathematik 41 (1983), S. 223-253 
    Details
    ISSN: 0945-3245
    Keywords: AMS: 65L05 ; 65L10 ; 34D15 CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary In this paper we consider singular perturbation problems for ordinary differential operators of ordern and their discrete counterparts on arbitrary nonuniform grids. We prove that the singularly perturbed initial value problem is stable uniformly in the perturbation parameter ε in both the continuous and the discrete case. We use this result to characterize the stability of the corresponding continuous and discrete boundary value problems. If the continuous problem is stable and if the consistency error is smaller than a certain constant, the discrete problem is also stable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01390214
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Die maximale Konsistenzordnung von Differenzenapproximationen nichtnegativer Art (1983)
    Springer
    Numerische Mathematik 42 (1983), S. 119-123 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65N10 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary Many difference methods for the numerical solution of elliptic boundary value problems lead to systems of linear equations whose matrices areM-matrices and which therefore have nonnegative inverses. In this paper it is shown, that these difference methods are at most consistent of second order.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01400922
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Die mehrstellenformeln für den Laplaceoperator (1980)
    Springer
    Numerische Mathematik 34 (1980), S. 171-187 
    Details
    ISSN: 0945-3245
    Keywords: AMS(MOS): 65N05 ; CR: 5.17
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary Difference methods for the numerical solution of linear partial differential equations may often be improved by using a weighted right hand side instead of the original right hand side of the differential equation. Difference formulas, for which that is possible, are called “Mehrstellenformeln’ or Hermitian formulas. In this paper the Hermitian formulas for the approximation of Laplace's operator are characterized by a very simple condition. We prove, that in two-dimensional case for a Hermitian formula of ordern at leastn+3 discretization points are necessary. We give examples of such optimal formulas of arbitrary high-order.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01396058
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    Paper (German National Licenses)
    Fulltext
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