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Journal of Mathematical Analysis and Applications
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Journal of Mathematical Analysis and Applications
Article . 1993
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Journal of Mathematical Analysis and Applications
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Axial Monogenic Functions from Holomorphic Functions

Axial monogenic functions from holomorphic functions
Authors: Common, A.K.; Sommen, F.;

Axial Monogenic Functions from Holomorphic Functions

Abstract

Axial monogenic functions \(f_ k\) are considered. These are solutions of the equation \((\partial_{\mathbf x} + \partial_{x_ 0}) f_ k = 0\) where \(\partial_{\mathbf x}\) is the Dirac operator of the Euclidean \(m\)- space of the form \[ f_ k(x) = \bigl[ A_ k (x_ 0, \rho) + e_ \rho B_ k (x_ 0, \rho) \bigr] P_ k (e_ \rho) \] where \(x = x_ 0 e_ 0 + {\mathbf x},x = \rho e_ \rho\), and \(P_ k\) is a spherical monogenic. The central result is that, given a holomorphic function \(f\), then \[ \int_{-1}^ 1(1 - t^ 2)^{k + (m - 3)/2} f(x_ 0 + i \rho t) (1 - it e_ \rho) dt P_ k ({\mathbf x}) \] is an axial monogenic function, where the integration path can be deformed in order to avoid singularities of \(f\). Notice that for \(\rho \sim 0\), \(f_ k(x) \sim f(x_ 0) P_ k ({\mathbf x})\). First this construction is compared with a construction using plane waves (monogenic functions depending only on the projection of \(x\) on a fixed plane), then it is applied to several specific cases, such as homogeneous axial monogenics. Further the axial exponential function, where \(f(x) = e^ z\) is treated, where an estimate for the modulus of the function is given. A second application is the theory of generalised orthogonal (Hermite and Gegenbauer) polynomials. Since these polynomials arise in the series expansion of axial monogenic functions (respectively the monogenic extensions of \(e^{ - \rho^ 2/2} P_ k ({\mathbf x})\) and \((1 - {\mathbf x}^ 2)^{ - \beta}\) for some \(\beta)\) the previous representation of axial monogenics can be used to obtain explicit expressions for these polynomials. Notice however that this explicit form was already given by the reviewer [the reviewer, Bull. Soc. Math. Belg., Sér. B 43, 1-17 (1991; Zbl 0721.33003)].

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Keywords

Hermite polynomials, Gegenbauer polynomials, Monogenic and polygenic functions of one complex variable, Dirac operator, Applied Mathematics, Analysis

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
15
Average
Top 10%
Average
hybrid