On the similarity between the Iwasawa projection and the diagonal part
J. J. Duistermaat (1984)
Mémoires de la Société Mathématique de France
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J. J. Duistermaat (1984)
Mémoires de la Société Mathématique de France
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Raoul Bott (1956)
Bulletin de la Société Mathématique de France
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Gregor Fels, Laura Geatti (1998)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
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Joe Jenkins (1989)
Studia Mathematica
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Rebecca A. Herb (1982)
Compositio Mathematica
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Peter Sjögren (1988)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
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Francescopaolo Montefalcone (2005)
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze
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Let be a -step Carnot group. The first aim of this paper is to show an interplay between volume and -perimeter, using one-dimensional horizontal slicing. What we prove is a kind of Fubini theorem for -regular submanifolds of codimension one. We then give some applications of this result: slicing of functions, integral geometric formulae for volume and -perimeter and, making use of a suitable notion of convexity, called, we state a Cauchy type formula for -convex sets. Finally,...