Volume 2,  Issue 3, 2001

Article 37

$ L^{p}$-IMPROVING PROPERTIES FOR MEASURES ON SUPPORTED ON HOMOGENEOUS SURFACES IN SOME NON ELLIPTIC CASES

E. FERREYRA, T. GODOY AND M. URCIUOLO

FACULTAD DE MATEMATICA, ASTRONOMIA Y FISICA-CIEM, 
UNIVERSIDAD NACIONAL DE CORDOBA, 
CIUDAD UNIVERSITARIA, 
5000 CORDOBA, ARGENTINA
E-Mail: eferrey@mate.uncor.edu
E-Mail: godoy@mate.uncor.edu
E-Mail: urciuolo@mate.uncor.edu

Received 08 January, 2001; accepted 05 June, 2001.
Communicated by: L. Pick


ABSTRACT.    In this paper we study convolution operators $ T_{\mu}$ with measures $ \mu$ in $ \mathbb{R}^{4}$ of the form $ \mu\left( E\right) =\int_{B}\chi_{E}\left(
x,\varphi\left( x\right) \right) dx,$ where $ B$ is the unit ball of $ \mathbb{%%
R}^{2}$, and $ \varphi$ is a homogeneous polynomial function. If $ \inf_{h\in
S^{1}}\left\vert \det\left( d_{x}^{2}\varphi\left( h,.\right) \right) \right\vert $ vanishes only on a finite union of lines, we prove that $ T_{\mu}$ is bounded from $ L^{p}$ into $ L^{q}$ if $ \left( \frac{1}{p},\frac{1}{q}\right) $ belongs to certain explicitly described trapezoidal region.
Key words:
Singular Measures, $ L^{p}$-Improving, Convolution Operators.

2000 Mathematics Subject Classification:
42B20, 42B10.


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