BORIS Theses

BORIS Theses
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On the signature of positive braids and adjacency for torus knots

Feller, Peter (2014). On the signature of positive braids and adjacency for torus knots. (Thesis). Universität Bern, Bern

14feller_p.pdf - Thesis
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The objects of study in this thesis are knots. More precisely, positive braid knots, which include algebraic knots and torus knots. In the first part of this thesis, we compare two classical knot invariants - the genus g and the signature σ - for positive braid knots. Our main result on positive braid knots establishes a linear lower bound for the signature in terms of the genus. In the second part of the thesis, a positive braid approach is applied to the study of the local behavior of polynomial functions from the complex affine plane to the complex numbers. After endowing polynomial function germs with a suitable topology, the adjacency problem arises: for a fixed germ f, what classes of germs g can be found arbitrarily close to f? We introduce two purely topological notions of adjacency for knots and discuss connections to algebraic notions of adjacency and the adjacency problem.

Item Type: Thesis
Dissertation Type: Single
Date of Defense: 2014
Additional Information: e-dissertation (edbe)
Subjects: 500 Science > 510 Mathematics
Institute / Center: 08 Faculty of Science > Department of Mathematics and Statistics > Institute of Mathematics
Depositing User: Admin importFromBoris
Date Deposited: 25 Jan 2019 12:59
Last Modified: 25 Jan 2019 12:59

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