Displaying 21 – 40 of 51

Showing per page

L’obstruction d’Euler locale d’une application

Nivaldo de Góes Grulha Júnior (2008)

Annales de la faculté des sciences de Toulouse Mathématiques

L’objectif dans ce travail est de présenter une généralisation pour l’obstruction d’Euler locale d’une fonction holomorphe singulière à l’origine dans le cas d’une application holomorphe f : ( V , 0 ) ( k , 0 ) , où ( V , 0 ) est un germe de variété analytique complexe, équidimensionnel de dimension n k . Le résultat principal (Théorème 6.1) exprime l’obstruction d’Euler locale, définie pour un k -repère par Brasselet, Seade, Suwa, en fonction de l’obstruction d’Euler relative à f .

On condition ( a f ) of a stratified mapping

Satoshi Koike (1983)

Annales de l'institut Fourier

For a stratified mapping f , we consider the condition ( a f ) concerning the kernel of the differential of f . We show that the condition ( a f ) is equivalent to the condition ( a f S ) which has a more obvious geometric content.

On topological classification of complex mappings

Hadi Seyedinejad, Ali Zaghian (2015)

Annales Polonici Mathematici

We study the topological invariant ϕ of Kwieciński and Tworzewski, particularly beyond the case of mappings with smooth targets. We derive a lower bound for ϕ of a general mapping, which is similarly effective as the upper bound given by Kwieciński and Tworzewski. Some classes of mappings are identified for which the exact value of ϕ can be computed. Also, we prove that the variation of ϕ on the source space of a mapping with a smooth target is semicontinuous in the Zariski topology.

Sur les feuilletages holomorphes singuliers de codimension 1.

Bouchra Gmira (1992)

Publicacions Matemàtiques

Let F be a codimension one holomorphic foliation whose singular set Σ is contained in a compact leaf S of F.When F is of dimension one, Σ is a set of isolated points {q1, ..., qr}, C. Camacho and P. Sad define the index of F at each point qk and prove that the sum of these indices equals the Euler class c1(E) of the fibre bundle E normal to S.Generally, whenever Σ is of any dimension m, we can define a such index iα along the maximal dimension strates {Σα} of a suitable stratification of the complex...

Currently displaying 21 – 40 of 51