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An algorithm for computing the topological Euler characteristic of complex projective varietiesPrimeFaces.cw("AccordionPanel","widget_formSmash_some",{id:"formSmash:some",widgetVar:"widget_formSmash_some",multiple:true}); PrimeFaces.cw("AccordionPanel","widget_formSmash_all",{id:"formSmash:all",widgetVar:"widget_formSmash_all",multiple:true});
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PrimeFaces.cw("AccordionPanel","widget_formSmash_responsibleOrgs",{id:"formSmash:responsibleOrgs",widgetVar:"widget_formSmash_responsibleOrgs",multiple:true}); (English)Manuscript (preprint) (Other academic)
##### Abstract [en]

##### National Category

Geometry
##### Research subject

Mathematics
##### Identifiers

URN: urn:nbn:se:su:diva-87357OAI: oai:DiVA.org:su-87357DiVA: diva2:602960
#####

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#####

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#####

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Available from: 2013-02-04 Created: 2013-02-04 Last updated: 2013-02-11Bibliographically approved
##### In thesis

We present an algorithm for the symbolic and numerical computation of the degrees of the Chern-Schwartz-MacPherson classes of a closed subvariety of projective space P^n. As the degree of the top Chern-Schwartz-MacPherson class is the topological Euler characteristic, this also yields a method to compute the topological Euler characteristic of projective varieties. The method is based on Aluffi's symbolic algorithm to compute degrees of Chern-Schwartz-MacPherson classes, a symbolic method to compute degrees of Segre classes, and the regenerative cascade by Hauenstein, Sommese and Wampler. The new algorithm complements the existing algorithms. We also give an example for using a theorem by Huh to compute an invariant from algebraic statistics, the maximum likelihood degree of an implicit model.

1. Topics in Computational Algebraic Geometry and Deformation Quantization$(function(){PrimeFaces.cw("OverlayPanel","overlay603248",{id:"formSmash:j_idt1258:0:j_idt1264",widgetVar:"overlay603248",target:"formSmash:j_idt1258:0:parentLink",showEvent:"mousedown",hideEvent:"mousedown",showEffect:"blind",hideEffect:"fade",appendToBody:true});});

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