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Jost, Christine
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Department of Mathematics
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Geometry
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Topics in Computational Algebraic Geometry and Deformation QuantizationPrimeFaces.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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2013 (English)Doctoral thesis, comprehensive summary (Other academic)
##### Abstract [en]

##### Place, publisher, year, edition, pages

Stockholm: Department of Mathematics, Stockholm University , 2013. , p. 20
##### Keywords [en]

Segre classes, Chern-Schwartz-MacPherson classes, topological Euler characteristic, computational algebraic geometry, numerical algebraic geometry, numerical homotopy methods, deformation quantization, polyvector fields, Fedosov quantization, Grothendieck-Teichmüller group
##### National Category

Geometry
##### Research subject

Mathematics
##### Identifiers

URN: urn:nbn:se:su:diva-87399ISBN: 978-91-7447-623-1 (print)OAI: oai:DiVA.org:su-87399DiVA, id: diva2:603248
##### Public defence

2013-03-11, room 14, house 5, Kräftriket, Roslagsvägen 101, Stockholm, 13:00 (English)
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##### Note

##### List of papers

This thesis consists of two parts, a first part on computations in algebraic geometry, and a second part on deformation quantization. More specifically, it is a collection of four papers. In the papers I, II and III, we present algorithms and an implementation for the computation of degrees of characteristic classes in algebraic geometry. Paper IV is a contribution to the field of deformation quantization and actions of the Grothendieck-Teichmüller group.

In Paper I, we present an algorithm for the computation of degrees of Segre classes of closed subschemes of complex projective space. The algorithm is based on the residual intersection theorem and can be implemented both symbolically and numerically.

In Paper II, we describe an algorithm for the computation of the degrees of Chern-Schwartz-MacPherson classes and the topological Euler characteristic of closed subschemes of complex projective space, provided an algorithm for the computation of degrees of Segre classes. We also explain in detail how the algorithm in Paper I can be implemented numerically. Together this yields a symbolical and a numerical version of the algorithm.

Paper III describes the Macaulay2 package CharacteristicClasses. It implements the algorithms from papers I and II, as well as an algorithm for the computation of degrees of Chern classes.

In Paper IV, we show that L-infinity-automorphisms of the Schouten algebra T_poly(R^d) of polyvector fields on affine space R^d which satisfy certain conditions can be globalized. This means that from a given L-infinity-automorphism of T_poly(R^d) an L-infinity-automorphism of T_poly(M) can be constructed, for a general smooth manifold M. It follows that Willwacher's action of the Grothendieck-Teichmüller group on T_poly(R^d) can be globalized, i.e., the Grothendieck-Teichmüller group acts on the Schouten algebra T_poly(M) of polyvector fields on a general manifold M.

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 3: Manuscript. Paper 4: Accepted.

Available from: 2013-02-14 Created: 2013-02-05 Last updated: 2022-02-24Bibliographically approved1. A method to compute Segre classes of subschemes of projective space$(function(){PrimeFaces.cw("OverlayPanel","overlay602953",{id:"formSmash:j_idt674:0:j_idt678",widgetVar:"overlay602953",target:"formSmash:j_idt674:0:partsLink",showEvent:"mousedown",hideEvent:"mousedown",showEffect:"blind",hideEffect:"fade",appendToBody:true});});

2. An algorithm for computing the topological Euler characteristic of complex projective varieties$(function(){PrimeFaces.cw("OverlayPanel","overlay602960",{id:"formSmash:j_idt674:1:j_idt678",widgetVar:"overlay602960",target:"formSmash:j_idt674:1:partsLink",showEvent:"mousedown",hideEvent:"mousedown",showEffect:"blind",hideEffect:"fade",appendToBody:true});});

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