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arXiv 1709.09504math.AGmath.CV
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加权齐次不可约曲线间映射的象Milnor数和$\mathscr{A}_e$余维数

Image Milnor number and $\mathscr{A}_e$-codimension for maps between weighted homogeneous irreducible curves

Daiane Alice Henrique Ament, Juan Jose Nuño Ballesteros, João Nivaldo Tomazella

摘要:

设$(X,0)\subset (\mathbb{C}^n,0)$是一个不可约的加权齐次奇异曲线,$f:(X,0)\to(\mathbb{C}^2,0)$是一个映射芽有限的一对一加权齐次且权值与$(X,0)$相同.我们证明了$\mathscr{A}_e$ - $codim(X,f)=μ_I(f)$,其中$\mathscr{A}_e$ - $codim(X,f)$是$\mathscr{A}_e$ -余维,即,在一个图像变形和$μ_I(f)$中的参数的最小数目是图像Milnor数,即,$f$的稳定化图像中的消失循环的数量。

英文摘要:

Let $(X,0)\subset (\mathbb{C}^n,0)$ be an irreducible weighted homogeneous singularity curve and let $f:(X,0)\to(\mathbb{C}^2,0)$ be a map germ finite, one-to-one and weighted homogeneous with the same weights of $(X,0)$. We show that $\mathscr{A}_e$-$codim(X,f)=μ_I(f)$, where $\mathscr{A}_e$-$codim(X,f)$ is the $\mathscr{A}_e$-codimension, i.e., the minimum number of parameters in a versal deformation and $μ_I(f)$ is the image Milnor number, i.e., the number of vanishing cycles in the image of a stabilisation of $f$.

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