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We discuss recent developments in the study of the homotopy classes for the Sobolev spaces . In particular, we report on the work of H. Brezis - Y. Li [5] and F.B. Hang - F.H. Lin [9].
On introduit dans le cadre des espaces vectoriels en dualité, deux vastes classes d’opérateurs non linéaires les opérateurs de type et les opérateurs pseudo-monotones. On met en évidence plusieurs de leurs propriétés analogues à celles des opérateurs monotones ; en particulier, on résoud pour ces opérateurs des problèmes abstraits de type elliptique et parabolique, des équations intégrales, des inéquations variationnelles stationnaires et d’évolution. Suivent quelques applications.
In questo articolo consideriamo alcune semplici equazioni a derivate parziali elittiche nonlineari, per le quali il Teorema della Funzione Inversa, se applicato in modo formale, suggerisce l'esistenza di soluzioni. Nonostante ciò, proviamo che non esistono soluzioni neppure in vari sensi deboli. Un problema modello è dato da in , su , dove , , è un dominio limitato contenente . Per qualunque costante , arbitrariamente piccola, proviamo che questo problema non ammette soluzioni distribuzionali...
We study degenerate elliptic problems of the type
We establish new estimates for the Laplacian, the div-curl system, and more general Hodge systems in arbitrary dimension , with data in . We also present related results concerning
differential forms with coefficients in the limiting Sobolev space .
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