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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

O número de Milnor de uma singularidade isolada

Oréfice, Bruna 24 November 2011 (has links)
Made available in DSpace on 2016-06-02T20:27:39Z (GMT). No. of bitstreams: 1 3945.pdf: 746734 bytes, checksum: 759f0299b121e175c4c8fc136f294b23 (MD5) Previous issue date: 2011-11-24 / Financiadora de Estudos e Projetos / Given (X; 0) C (CN; 0) a weighted homogeneous germ of hypersurface with isolated singularity and f : (CN; 0) - C a germ of function finitely determined with respect to X, we show that UBR(f;X) = U(f) + U(X; f), where U(f) and U(X; f) denote the Milnor numbers of f and of the fiber X \ f&#56256;&#56320;1(0), respectively, and UBR(f;X) is the Bruce-Roberts number of f with respect to X. We show that the logarithmic characteristic subvariety, LC(X), is Cohen-Macaulay and we get relations between the Bruce-Roberts number and the Euler obstruction. Given F : (CN; 0) ! Mm;n(C) a holomorphic function germ, let (X; 0) be the isolated determinantal singularity given by X = F-1(Ms m;n(C)) where Ms m;n(C) is the set of the complex matrices with rank less then s, with s an integer number between 0 and minfm; ng such that N < (m - s + 2)(n - s + 2), we will define the vanishing Euler characteristic of (X; 0) and the Milnor number of a holomorphic function germ with an isolated singularity at X, f : (X; 0) - C. / Dados (X; 0) C (CN; 0) um germe de hipersuperfície quase homogêneo com singularidade isolada e f : (CN, 0) - C um germe de função finitamente determinado com respeito a X, mostramos que UBR(f;X) = U(f) + U(X; f), onde U(f) e U(X; f) denotam o número de Milnor de f e da fibra X \ f-1(0), respectivamente, e _BR(f;X) é o número de Bruce-Roberts de f com respeito a X. Mostramos que a variedade logarítmica característica LC(X) é Cohen-Macaulay e obtemos relações entre o número de Bruce-Roberts e a obstrução de Euler. Dado F : (CN; 0) ! Mm;n(C) um germe de função holomorfa, seja (X; 0) a singularidade determinantal isolada dada por X = F-1(Ms m;n(C)) onde Ms m;n(C) é o conjunto das matrizes complexas com posto menor que s, com s um número inteiro entre 0 e minfm; ng tal que N < (m-s+2)(n-s+2), definimos a característica de Euler evanescente de (X; 0) e o número de Milnor de um germe de função holomorfa com uma singularidade isolada em X, f : (X; 0) - C.

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