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Formal relations between quasianalytic functions of some fixed class

F. Broglia, A. Elkhadiri, F. Pieroni (2004)

Annales Polonici Mathematici

In [Ga] Gabrielov has given conditions under which the completion of the kernel of a morphism φ: A → B between analytic rings coincides with the kernel of the induced morphism φ̂: Â → B̂ between the completions. If B is a domain, a sufficient condition is that rk φ = dim(Â/ker φ̂), where rk φ is the rank of the jacobian matrix of φ considered as a matrix over the quotient field of B. We prove that the above property holds in a fixed quasianalytic Denjoy-Carleman class if and only if the class coincides...

Grauert's theorem for subanalytic open sets in real analytic manifolds

Daniel Barlet, Teresa Monteiro Fernandes (2011)

Studia Mathematica

By an open neighbourhood in ℂⁿ of an open subset Ω of ℝⁿ we mean an open subset Ω' of ℂⁿ such that ℝⁿ ∩ Ω' = Ω. A well known result of H. Grauert implies that any open subset of ℝⁿ admits a fundamental system of Stein open neighbourhoods in ℂⁿ. Another way to state this property is to say that each open subset of ℝⁿ is Stein. We shall prove a similar result in the subanalytic category: every subanalytic open subset in a paracompact real analytic manifold M admits a fundamental system of subanalytic...

Hamiltonian stability and subanalytic geometry

Laurent Niederman (2006)

Annales de l’institut Fourier

In the 70’s, Nekhorochev proved that for an analytic nearly integrable Hamiltonian system, the action variables of the unperturbed Hamiltonian remain nearly constant over an exponentially long time with respect to the size of the perturbation, provided that the unperturbed Hamiltonian satisfies some generic transversality condition known as steepness. Using theorems of real subanalytic geometry, we derive a geometric criterion for steepness: a numerical function h which is real analytic around a...

Implicit function theorem for locally blow-analytic functions

Laurentiu Paunescu (2001)

Annales de l’institut Fourier

In this paper we prove the implicit function theorem for locally blow-analytic functions, and as an interesting application of using blow-analytic homeomorphisms, we describe a very easy way to resolve singularities of analytic curves.

Intégration des fonctions sous-analytiques et volumes des sous-ensembles sous-analytiques

Jean-Marie Lion, Jean-Philippe Rolin (1998)

Annales de l'institut Fourier

Soit f ( x , y ) une fonction sous-analytique de R n × R m à valeurs dans R + . Nous montrons que l’intégrale ∫ R m f ( x , y ) d y est une fonction log-analytique de x . Nous en déduisons que le volume k -dimensionnel des éléments Y x d’une famille sous-analytique de sous-ensembles sous-analytiques globaux de l’espace euclidien R m est une fonction log-analytique de x . Un corollaire de ce résultat est le caractère log-analytique de la fonction densité k -dimensionnelle d’un sous-analytique global de dimension k en tout point de sa fermeture topologique....

Invariance of domain in o-minimal structures

Rafał Pierzchała (2001)

Annales Polonici Mathematici

The aim of this paper is to prove the theorem on invariance of domain in an arbitrary o-minimal structure. We do not make use of the methods of algebraic topology and the proof is based merely on some basic facts about cells and cell decompositions.

K-subanalytic rectilinearization and uniformization

Artur Piękosz (2003)

Open Mathematics

We prove rectilinearization and uniformization theorems for K-subanalytic (∝anK-definable) sets and functions using the Lion-Rolin formula. Parallel reasoning gives standard results for the subanalytic case.

Le théorème de complexification semi-propre

E. Fortuna, M. Galbiati (1983)

Annales de l'institut Fourier

Il est bien connu que l’image d’une application analytique complexe semi-propre est un ensemble analytique; dans le cas réel elle est en général sous-analytique. Dans cet article on donne des conditions pour la semi-analyticité de l’image d’une application analytique réelle, semi-propre qui admet une complexification semi-propre.

Lipschitz properties of semi-analytic sets

Adam Parusiński (1988)

Annales de l'institut Fourier

The existence of Lipschitz stratification, in the sense of Mostowski, for compact semi-analytic sets is proved. (This stratification ensures the constance of the Lipschitz type along each stratum). The proof is independent of the complex case, considered by Mostowski, and gives also some other Lipschitz properties of semi-analytic sets.

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