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    Functions with derivatives given by polynomials in the function itself or a related function

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    Franssens(2007).pdf (147.6Kb)
    Authors
    Franssens, G.R.
    Discipline
    Mathematics
    Audience
    Scientific
    Date
    2007
    Metadata
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    Description
    We construct the set of holomorphic functions S 1 = {f: Ω f ⊆ ℂ → ℂ} whose members have n-th order derivatives which are given by a polynomial of degree n+1 in the function itself. We also construct the set of holomorphic functions S 2 = {g: Ω g ⊆ ℂ → ℂ} whose members have n-th order derivatives which are given by the product of the function itself with a polynomial of degree n in an element of S 1. The union S 1 ∪ S 2 contains all the hyperbolic and trigonometric functions. We study the properties of the polynomials involved and derive explicit expressions for them. As particular results, we obtain explicit and elegant formulas for the n-th order derivatives of the hyperbolic functions tanh, sech, coth and csch and the trigonometric functions tan, sec, cot and csc.
    Citation
    Franssens, G.R. (2007). Functions with derivatives given by polynomials in the function itself or a related function. , Analysis Mathematica, Vol. 33, Issue 1, 17-36, DOI: 10.1007/s10474-007-0102-5.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/4365
    doi: http://dx.doi.org/10.1007/s10474-007-0102-5
    scopus: 2-s2.0-33847407138
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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