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Global estimates in Sobolev spaces for homogeneous Hörmander sums of squares
Journal of Mathematical Analysis and Applications ( IF 1.3 ) Pub Date : 2021-01-09 , DOI: 10.1016/j.jmaa.2021.124935 Stefano Biagi , Andrea Bonfiglioli , Marco Bramanti
中文翻译:
Sobolev空间中均方Hörmander平方和的全局估计
更新日期:2021-01-13
Journal of Mathematical Analysis and Applications ( IF 1.3 ) Pub Date : 2021-01-09 , DOI: 10.1016/j.jmaa.2021.124935 Stefano Biagi , Andrea Bonfiglioli , Marco Bramanti
Let be a Hörmander sum of squares of vector fields in space , where any is homogeneous of degree 1 with respect to a family of non-isotropic dilations in space. In this paper we prove global estimates and regularity properties for in the X-Sobolev spaces , where . In our approach, we combine local results for general Hörmander sums of squares, the homogeneity property of the 's, plus a global lifting technique for homogeneous vector fields.
中文翻译:
Sobolev空间中均方Hörmander平方和的全局估计
让 是空间中矢量场的平方和 ,如果有 相对于空间中的各向同性膨胀族,是1度的均质。在本文中,我们证明了在X -Sobolev空间,在哪里 。在我们的方法中,我们结合了一般Hörmander平方和的局部结果,即,以及用于齐次矢量场的全局提升技术。