À l’aide d’un théorème de division de séries entières convergentes avec estimation des normes sur un système fondamental de polydisques, on démontre un théorème de “passage du formel au convergent”. Ceci nous permet d’étudier les morphismes stables et plats entre germes d’espaces analytiques singuliers.

It has been known for a long time that the Szegö projection of tube domains over irreducible symmetric cones is unbounded in $L^p$ for $p\ne 2$. Indeed, this is a consequence of the fact that the characteristic function of a disc is not a Fourier multiplier, a fundamental theorem proved by C. Fefferman in the 70’s. The same problem, related to the Bergman projection, deserves a different approach. In this survey, based on joint work of the author with D. Békollé, G. Garrigós, M. Peloso and F. Ricci, we give...

In this survey article we describe how the recent work in quantization in multi-variable complex geometry (domains of holomorphy, symmetric domains, tube domains, etc.) leads to interesting results and problems in C*-algebras which can be viewed as examples of the "non-commutative geometry" in the sense of A. Connes. At the same time, one obtains new functional calculi (of pseudodifferential type) with possible applications to partial differential equations and group representations.

Si dà una caratterizzazione completa per tracce di funzioni olomorfe a quadrato sommabile per particolari misure su domini tubolari.

On introduit une classe de domaines dans ${\mathbf{C}}_{\left(z\right)}^n={\mathbf{R}}_{\left(x\right)}^n\times {\mathbf{R}}_{\left(y\right)}^n$ appelés tuboïdes. Un tuboïde $D={\cup }_{x\in \Omega }(x,D_x)$ de profil $\Lambda ={\cup }_{x\in \Omega }(x,{\Lambda }_x)$ est un domaine de ${\mathbf{C}}_{\left(z\right)}^n$ dont chaque fibre $D_x$ (dans ${\mathbf{R}}_{\left(y\right)}^n)$ admet ${\Lambda }_x$ comme cône tangent à l’origine.On montre dans la première partie que l’enveloppe d’holomorphie d’un tuboïde $\widehat{D}$ de profil $\widehat{\Lambda }={\cup }_{x\in \Omega }(x,{\widehat{\Lambda }}_x)$ où ${\widehat{\Lambda }}_x$ est pour tout $x$ l’enveloppe convexe de ${\Lambda }_x$. dans la deuxième partie, l’on montre alors que tout tuboïde $D$ dont le profil $\Lambda$ a toutes ses fibres ${\Lambda }_x$ convexes contient un tuboïde $D^{\text{'}}$ de même profil qui est de plus un domaine d’holomorphie....

For complete Reinhardt pairs “compact set - domain” K ⊂ D in ℂⁿ, we prove Zahariuta’s conjecture about the exact asymptotics $ln{d}_s\left(A_K^D\right)-{((n!s)/\tau (K,D))}^{1/n}$, s → ∞, for the Kolmogorov widths $d_s\left(A_K^D\right)$ of the compact set in C(K) consisting of all analytic functions in D with moduli not exceeding 1 in D, τ(K,D) being the condenser pluricapacity of K with respect to D.

We exhibit a class of bounded, strongly convex Hartogs domains with real-analytic boundary which are not Lu Qi-Keng, i.e. whose Bergman kernel function has a zero.