On a problem concerning quasianalytic local rings

• Autorzy: Hassan Sfouli
• Języki publikacji: EN

Abstrakty

EN

Let (𝓒ₙ)ₙ be a quasianalytic differentiable system. Let m ∈ ℕ. We consider the following problem: let $f ∈ 𝓒_{m}$ and f̂ be its Taylor series at $0 ∈ ℝ^{m}$. Split the set $ℕ^{m}$ of exponents into two disjoint subsets A and B, $ℕ^{m} = A ∪ B$, and decompose the formal series f̂ into the sum of two formal series G and H, supported by A and B, respectively. Do there exist $g,h ∈ 𝓒_{m}$ with Taylor series at zero G and H, respectively? The main result of this paper is the following: if we have a positive answer to the above problem for some m ≥ 2, then the system (𝓒ₙ)ₙ is contained in the system of analytic germs. As an application of this result, we give a simple proof of Carleman's theorem (on the non-surjectivity of the Borel map in the quasianalytic case), under the condition that the quasianalytic classes considered are closed under differentiation, for n ≥ 2.

Kategorie tematyczne

• 14P20: Nash functions and manifolds
• 26E10: C ∞ -functions, quasi-analytic functions

• Wydawca: Institute of Mathematics Polish Academy of Sciences
• Czasopismo: Annales Polonici Mathematici
• Rocznik: 2014
• Tom: 111
• Numer: 1
• Strony: 13-20

Daty

wydano

2014

Twórcy

autor

Hassan Sfouli

• Département de Mathématiques, Faculté des Sciences, Université Ibn Tofail, BP 133 Kénitra, Maroc

Identyfikatory

DOI

10.4064/ap111-1-2