- 07/2011 - 11/2020
- REFUSiON GmbH, Zürich, Switzerland:
software development, project management, system administration,
specialized in Magento eCommerce solutions, developing and maintaining Web applications - 04/2010 – 05/2011
- routeRANK Ltd., Lausanne, Switzerland:
developer and lead developer (since 01/2011),
using Ruby, PHP, JavaScript, SQL, HTML, CSS,
developing, maintaining, and optimizing a multi-modal travel planning tool, development of new features,
additional responsibilities: research, scientific publications, database administration, server administration, project management - 09/2006 – 04/2010
- Ecole Polytechnique Fédérale de Lausanne, Switzerland:
assistant to Prof. Eva Bayer-Fluckiger,
teaching assistant for various courses in mathematics - 04/2005 – 07/2005
& 04/2003 – 03/2004
& 04/2002 – 09/2002 - Georg-August Universität Göttingen, Germany:
teaching assistant for various courses in mathematics - 10/2000 - 03/2002
- Prof. Schumann GmbH, Göttingen, Germany:
developer, using Java,
developing and maintaining a credit risk management software
Klaas-Tido Rühl
CV
professional CV
academic CV
- 04/2010
- public Ph.D. defense,
obtainment of doctorate - 12/2008
- 2 weeks research stay (in the context of the GTEM network) at the Université Pierre et Marie Curie (Paris 6), France
- 09/2008 - 10/2008
- 5 weeks research stay (in the context of the GTEM network) at the University of Bordeaux 1, France
- 03/2008 - 06/2008
- 3 months research stay (in the context of the GTEM network) at the University of Leiden, Netherlands
- 08/2007 - 07/2010
- Marie Curie Actions fellow, ESR (Early Stage Researcher) of the EPFL node of the GTEM network (Galois Theory and Explicit Methods)
- 05/2007 - 04/2010
- member of the doctoral school at the EPFL, Lausanne, Switzerland
- 09/2006 - 07/2010
- graduate studies in mathematics and assistant at the EPFL, Lausanne, Switzerland
- 08/2005 - 05/2006
- graduate studies in mathematics at UC Berkeley, California, USA, through the EAP
- 02/2005
- graduation ("Diplom")
- 04/2001
- intermediate examination ("Vordiplom")
- 10/1999 - 02/2005
- studies in mathematics (minor: computer studies) at the Georg-August-Universität, Germany
academia
publications
-
Annihilating Ideals of Quadratic Forms over Local and Global Fields
(Electronic version of an article accepted for publishing by the International Journal of Number Theory © [copyright World Scientific Publishing Company] [http://www.worldscinet.com/ijnt/])
version of August 24, 2009 (accepted by International Journal of Number Theory)
-
Annihilating Polynomials of Excellent Quadratic Forms
version of February 20, 2008 (Arch. Math., Vol. 90 (3), 2008, springer link)
Ph.D. thesis
Annihilating Polynomials for Quadratic Forms
Already Ernst Witt noticed, that the Witt ring (of quadratic forms) of a field is integral (over the integers), but it took until 1987 for David Lewis to construct specific polynomials (with integer coefficients), which annihilate the isometry and equivalence classes of quadratic forms of a given dimension over an arbitrary field. In this thesis we study annihilating polynomials for quadratic forms (i.e. for the isometry or equivalence class of a quadratic form). In particular we study the annihilating ideal for a given quadratic form, i.e. the ideal consisting of all annihilating polynomials for that quadratic form. It is our aim to achieve a general understanding of the structure of these annihilating ideals, and to develop methods that allow us to determine annihilating ideals for isometry and equivalence classes of quadratic forms over a given field.
download: Annihilating Polynomials for Quadratic Forms", version from April 11, 2010
diploma thesis
Generic Splitting of Quadratic Forms
This thesis is a rather substantial recapitulation of the progress the theory of generic splitting of quadratic forms has made since it was first introduced in 1976 by Manfred Knebusch. The thesis deals with the results about this theory that can be obtained with elementary methods. Of special importance are the results by Detlev Hoffmann, since with the help of them it becomes possible to simplify the proofs of a numbers of less recent results.
selected talks
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Annihilating Polynomials of Excellent Quadratic Forms (Presentation)
GTEM network conference "Number Fields, Lattices and Curves" in Cetraro, Italy
-
Annihilating Polynomials of Quadratic Forms (corrected version - May 8, 2008)
University of Leiden, Netherlands
-
Annihiating Ideals of Quadratic Forms over Local and Global Fields (Presentation)
GTEM network, First Annual Meeting in Leiden, Netherlands
-
An Introduction to Quadratic Forms
seminar "The Hasse-Minkowski Theorem" at EPFL, Switzerland
-
Eine Einführung in die multiplikativen und runden Formen
seminar "Quadratic Forms", held by Prof. Ina Kersten at Georg-August-Universität Göttingen