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Monotonic invariants under blowups
International Journal of Mathematics ( IF 0.6 ) Pub Date : 2020-08-07 , DOI: 10.1142/s0129167x20500937
Zhenjian Wang 1
Affiliation  

We prove that the numerical invariant [Formula: see text] of a reduced irreducible plane curve singularity germ is non-negative, non-decreasing under blowups and strictly increasing unless the curve is non-singular. This provides a new perspective to understand the question posed by Dimca and Greuel. Moreover, our work can be put in the general framework of discovering monotonic invariants under blowups.

中文翻译:

爆破下的单调不变量

我们证明了一个简化的不可约平面曲线奇点芽的数值不变量[公式:见正文]是非负的,在爆破下不减,并且除非曲线是非奇的,否则严格增加。这为理解 Dimca 和 Greuel 提出的问题提供了新的视角。此外,我们的工作可以放在在爆炸下发现单调不变量的一般框架中。
更新日期:2020-08-07
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