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arXiv 2005.10155math.AGmath.GT
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有理曲面上极小一般曲线的局部不变量

Local invariants of minimal generic curves on rational surfaces

José Ignacio Cogolludo-Agustín, Tamás László, Jorge Martín-Morales, András Némethi

摘要:

设(C,0)是法向曲面奇点(X,0)中的约化曲线芽.主要目标是从嵌入的拓扑中恢复抽象曲线(C,0)的delta不变量。当(C,0)是极小通有且(X,0)是有理的时,我们给出了明确的公式(作为作者以前工作的延续)。证明了如果(X,0)是商奇点,则(C,0)的delta不变量只允许值r-1或r,其中r是(C,0)的不可约分支数. (r-1实现了极值下界,仅对“普通r元组”有效。)

英文摘要:

Let (C,0) be a reduced curve germ in a normal surface singularity (X,0). The main goal is to recover the delta invariant of the abstract curve (C,0) from the topology of the embedding. We give explicit formulae whenever (C,0) is minimal generic and (X,0) is rational (as a continuation of previous works of the authors). Additionally we prove that if (X,0) is a quotient singularity, then the delta invariant of (C,0) only admits the values r-1 or r, where r is the number or irreducible components of (C,0). (r-1 realizes the extremal lower bound, valid only for `ordinary r-tuples'.)

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