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Une généralisation des nombres de Milnor pour les intersections complètes à singularités non isolées

100%

Lehmann D.

Banach Center Publications

1998

tom 45

nr 1

177-182

Global structure of holomorphic webs on surfaces

63%

Cavalier V., Lehmann D.

Banach Center Publications

2008

tom 82

nr 1

35-44

The webs have been studied mainly locally, near regular points (see a short list of references on the topic in the bibliography). Let d be an integer ≥ 1. A d-web on an open set U of ℂ² is a differential equation F(x,y,y') = 0 with $F(x,y,y') = ∑_{i=0}^{d} a_i(x,y)(y')^{d-i}$, where the coefficients $a_i$ are holomorphic functions, a₀ being not identically zero. A regular point is a point (x,y) where the d roots in y' are distinct (near such a point, we have locally d foliations mutually transverse to each other, and caustics appear through the points which are not regular). It happens that many concepts on local webs may be globalized, but not always in an obvious way, and under the condition that they do not depend on local coordinates. The aim of this paper is to make these facts precise and to define the tools necessary for a global study of webs on a holomorphic surface, and in particular on the complex projective plane ℙ₂. Moreover new concepts, inducing new problems, will appear, such as the dicriticality, the irreducibility or the quasi-smoothness, which have no interest locally near a regular point of the web.

Ograniczanie wyników

2 Banach Center Publications

2 Lehmann D.

1 Cavalier V.

1 2008

1 1998

Wyniki wyszukiwania

Une généralisation des nombres de Milnor pour les intersections complètes à singularités non isolées

Global structure of holomorphic webs on surfaces