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On some fractional integrals and their applications. (English) Zbl 0617.35006

Behandelt werden Operatoren der Form \[ I_ p(\eta,\alpha)f(x):=2^{\alpha -1} p^{1-\alpha} x^{-(\alpha +\eta)}\int^{x}_{0}u^ n[\frac{x-u}{x}]^{(\alpha -1)/2}\cdot J_{\alpha -1}\{p\sqrt{(x^ 2-xu)}\}f(u)du \] mit \(\alpha >0\), \(p\geq 0\), \(J_{\alpha -1}..\). Besselfunktion erster Art. Es wird gezeigt, daß die Beziehung \[ I_ p(\eta,\alpha)M^{(x)}_{2(\alpha +\eta)}f(x)=[M^{(x)}_{2(\alpha +\eta)}+(px)^ 2]I_ p(\eta,\alpha)f(x),\quad x>0, \] gilt, mit \(M_{\gamma}^{(x)}:=x^{- (\gamma -1)}Dx^{\gamma +1} D\), \(D:=d/dx.\)
Mittels dieser Beziehung werden Lösungsdarstellungen für die verallgemeinerte biaxialsymmetrische Helmholtzgleichung (GBSHE) \[ \partial^ 2 v/\partial x^ 2+\partial^ 2 v/\partial y^ 2+(2\alpha /x)\partial v/\partial x+(2\beta /y)\partial v/\partial y+k^ 2 v=0,\quad k\geq 0 \] angegeben. In ähnlicher Weise werden Gleichungen der Form \[ \sum^{n}_{i=1}\partial^ 2 w/\partial x^ 2_ i+\partial^ 2 w/\partial \rho^ 2+(s/\rho)\partial w/\partial \rho +k^ 2 w=0,\quad k\geq 0,\quad s>-1, \]
\[ \partial^ 2 v/\partial x^ 2+\partial^ 2 v/\partial y^ 2+(2\alpha /y)\partial v/\partial y+k^ 2 v=0,\quad k\geq 0, \] behandelt und eine Inversionsformel der Kontorovich-Lebedev-Transformation hergeleitet.
Reviewer: R.Heersink

MSC:

35A25 Other special methods applied to PDEs
35C05 Solutions to PDEs in closed form
35J05 Laplace operator, Helmholtz equation (reduced wave equation), Poisson equation
26A33 Fractional derivatives and integrals
Full Text: DOI

References:

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