Weighted Poincaré and Sobolev inequalities for vector fields satisfying Hörmander's condition and applications.

Autores: Guozhen Lu
Localización: Revista matemática iberoamericana, ISSN 0213-2230, Vol. 8, Nº 3, 1992, págs. 367-440
Idioma: inglés
DOI: 10.4171/rmi/129
Títulos paralelos:
- Desigualdades ponderadas de Poincaré y Sobolev para campos vectoriales que satisfacen la condición de Hörmander y aplicaciones.
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Resumen
- In this paper we mainly prove weighted Poincaré inequalities for vector fields satisfying Hörmander's condition. A crucial part here is that we are able to get a pointwise estimate for any function over any metric ball controlled by a fractional integral of certain maximal function. The Sobolev type inequalities are also derived. As applications of these weighted inequalities, we will show the local regularity of weak solutions for certain classes of strongly degenerate differential operators formed by vector fields.