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La surjectivité de l’application moyenne pour les espaces préhomogènes. (English) Zbl 0557.43007
Let f be a homogeneous polynomial on \({\mathbb{R}}^ n\). For C a connected component of \(\{f(x)\neq 0\}\) and s a complex number one considers the integral \(Z(\phi,s)=\int_{C}\phi (x)| f(x)|^ sdx,\) where \(\phi\) is a test function. This integral converges for Re s\(>0\) and admits a meromorphic continuation. The author studies the distributions occurring as coefficients in the Laurent developments of the function \(s\mapsto Z(\phi,s)\) at its poles. He proves a generalization of a theorem of Borel, which corresponds to the special case \(f(x)=x\), \(n=1\), and says: for any sequence \(c_ k\) of complex numbers there exists a \(C^{\infty}\) function \(\phi\) on \({\mathbb{R}}\) such that \(\phi^{(k)}(0)=c_ k.\) Let \(M_{\phi}(t)\) be the integral of \(\phi\) on \(\{f(x)=t\}\cap C.\) As a corollary of the previous result, since Z(\(\phi\),s) is the Mellin transform of \(M_{\phi}(t)\), the space of the functions \(M_{\phi}\) can be described in terms of asymptotic developments at 0.
Reviewer: J.Faraut

MSC:
43A85 Harmonic analysis on homogeneous spaces
46F10 Operations with distributions and generalized functions
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