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Cyclic coverings of Fano threefolds

Sławomir Cynk (2003)

Annales Polonici Mathematici

We describe a series of Calabi-Yau manifolds which are cyclic coverings of a Fano 3-fold branched along a smooth divisor. For all the examples we compute the Euler characteristic and the Hodge numbers. All examples have small Picard number ϱ = h 1 , 1 .

Cylindrical real hyper surfaces in 𝐂 n

Claudio Rea (1981)

Atti della Accademia Nazionale dei Lincei. Classe di Scienze Fisiche, Matematiche e Naturali. Rendiconti Lincei. Matematica e Applicazioni

Si stabiliscono due condizioni sufficienti per un germe di ipersuperficie reale di classe c in 𝐂 n affinchè esistano coordinate olomorfe rispetto alle quali l'ipersuperficie risulti essere il luogo di zeri di una funzione di k < n variabili e k sia minimale rispetto a questa proprietà. In altre parole si vuole che l'ipersuperficie, a meno di una trasformazione bi-olomorfa, sia l’unione di sottovarietà lineari complesse, parallele di dimensione n k .

Decay of volumes under iteration of meromorphic mappings

Vincent Guedj (2004)

Annales de l'Institut Fourier

Let f be a meromorphic self-mapping of a compact Kähler manifold. We study the rate of decreasing of volumes under the iteration of f . We use these volume estimates to construct the Green current of f in a quite general setting.

Décomposition formelle d'un système microdifférentiel aux points génériques

Rui Rodrigues (1992)

Annales de l'institut Fourier

Soit X une variété analytique complexe et T * X X son fibre cotangent. Soit M un module cohérent sur l’anneau des opérateurs microdifférentiels formels sur X . Dans le cas ou le support (ou variété caractéristique) de M est une hypersurface, B. Malgrange a démontre que M se décompose en systèmes élémentaires au point générique et après tensorisation par l’anneau des opérateurs microdifférentiels d’ordre q - fractionnaire avec q approprie.Dans ce travail, on généralise le résultat cité : d’abord pour un...

Decomposition into special cubes and its applications to quasi-subanalytic geometry

Krzysztof Jan Nowak (2009)

Annales Polonici Mathematici

The main purpose of this paper is to present a natural method of decomposition into special cubes and to demonstrate how it makes it possible to efficiently achieve many well-known fundamental results from quasianalytic geometry as, for instance, Gabrielov's complement theorem, o-minimality or quasianalytic cell decomposition.

Decomposition of CR-manifolds and splitting of CR-maps

Atsushi Hayashimoto, Sung-Yeon Kim, Dmitri Zaitsev (2003)

Annali della Scuola Normale Superiore di Pisa - Classe di Scienze

We show the uniqueness of local and global decompositions of abstract CR-manifolds into direct products of irreducible factors, and a splitting property for their CR-diffeomorphisms into direct products with respect to these decompositions. The assumptions on the manifolds are finite non-degeneracy and finite-type on a dense subset. In the real-analytic case, these are the standard assumptions that appear in many other questions. In the smooth case, the assumptions cannot be weakened by replacing...

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