### Solvability for a class of non-homogeneous differential operators on two-step nilpotent groups.

Fulvio Ricci, Detlef Müller (1996)

Mathematische Annalen

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Fulvio Ricci, Detlef Müller (1996)

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2010 Mathematics Subject Classification: Primary 35L05. Secondary 46E35, 35J25, 22E30. In this paper we define the homogeneous Besov spaces associated with the Dunkl operators on R^d, and we give a complete analysis on these spaces and same applications.

Michael Shapiro (1989)

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J. van Mill, G. J. Ridderbos (2005)

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We study retracts of coset spaces. We prove that in certain spaces the set of points that are contained in a component of dimension less than or equal to n, is a closed set. Using our techniques we are able to provide new examples of homogeneous spaces that are not coset spaces. We provide an example of a compact homogeneous space which is not a coset space. We further provide an example of a compact metrizable space which is a retract of a homogeneous compact space, but which is not...

Anders Melin (1981)

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