Functions with derivatives given by polynomials in the function itself or a related function
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Authors
Franssens, G.R.
Discipline
Mathematics
Audience
Scientific
Date
2007Metadata
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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
scopus: 2-s2.0-33847407138
Type
Article
Peer-Review
Yes
Language
eng