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On the group of real analytic diffeomorphisms

Takashi Tsuboi (2009)

Annales scientifiques de l'École Normale Supérieure

The group of real analytic diffeomorphisms of a real analytic manifold is a rich group. It is dense in the group of smooth diffeomorphisms. Herman showed that for the n -dimensional torus, its identity component is a simple group. For U ( 1 ) fibered manifolds, for manifolds admitting special semi-free U ( 1 ) actions and for 2- or 3-dimensional manifolds with nontrivial U ( 1 ) actions, we show that the identity component of the group of real analytic diffeomorphisms is a perfect group.

Real commutative algebra. III. Dedekind-Weber-Riemann manifolds.

D. W. Dubois, A. Bukowski (1980)

Revista Matemática Hispanoamericana

The space S of all non-trivial real places on a real function field K|k of trascendence degree one, endowed with a natural topology analogous to that of Dedekind and Weber's Riemann surface, is shown to be a one-dimensional k-analytic manifold, which is homeomorphic with every bounded non-singular real affine model of K|k. The ground field k is an arbitrary ordered, real-closed Cantor field (definition below). The function field K|k is thereby represented as a field of real mappings of S which might...

Sur certains sous-ensembles de l'espace euclidien

Jean-Yves Charbonnel (1991)

Annales de l'institut Fourier

Soit 𝒜 ˜ m l’algèbre des fonctions sur R n engendrée par les fonctions polynomiales et les exponentielles de formes linéaires. La partie S de R n appartient à 𝒫 n si et seulement s’il existe m et F dans 𝒜 ˜ n + m pour lesquels S est l’image par la projection canonique de R n + m sur R n , de l’ensemble des zéros de F . Soit 𝒫 ˜ n le plus petit sous-ensemble de parties de R n qui contient 𝒫 n , l’adhérence de ses éléments et les images par la projection canonique de R n qui contient 𝒫 n , l’adhérence de ses éléments et les images par la...

The Gaussian measure on algebraic varieties

Ilka Agricola, Thomas Friedrich (1999)

Fundamenta Mathematicae

We prove that the ring ℝ[M] of all polynomials defined on a real algebraic variety M n is dense in the Hilbert space L 2 ( M , e - | x | 2 d μ ) , where dμ denotes the volume form of M and d ν = e - | x | 2 d μ the Gaussian measure on M.

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