Nonlinear and multiplicative inequalities in Sobolev spaces associated with Lie algebras |
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Authors: | Vladimir Georgiev Sandra Lucente |
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Institution: | 1. Dipartimento di Matematica, Università degli Studi di Pisa, Largo Bruno Pontecorvo 5, I-56127 Pisa, Italy;2. Dipartimento di Matematica, Università degli Studi di Bari, Via Orabona 4, I-70125 Bari, Italy |
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Abstract: | This paper is devoted to multiplicative inequalities in some generalized Sobolev spaces associated with Lie algebras. These Lie algebras are generated by the differential operator of variable coefficients or by pseudo-differential operators having non-regular symbols. Under geometrical assumptions we show that the norms of two suitable classes of generalized Sobolev spaces are equivalent. This leads to the proof that the composition operator u→|u|p acts on such spaces. |
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Keywords: | 47H30 35S05 |
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