Rebecca Waldecker
Professor for Algebra
Professor for Algebra
Photo: Karsten Möbius (2018)
Contact
Phone
+49 345 5524623
Fax
+49 345 5527002
Email
rebecca.waldecker[at]mathematik.unihalle.de
Postal adress Prof. Dr. Rebecca Waldecker Martin Luther University HalleWittenberg Institut of Mathematics 06099 Halle (Saale)
Research interests  Finite Groups  Classification results and applications
 Group theoretical arguments for improved algorithmsDiese Seite auf Deutsch
Postal adress Prof. Dr. Rebecca Waldecker Martin Luther University HalleWittenberg Institut of Mathematics 06099 Halle (Saale)
Research interests  Finite Groups  Classification results and applications
 Group theoretical arguments for improved algorithms
Rebecca Waldecker  Professor
for Algebra
Currriculum vitae
My full name is Rebecca Anne Hedwig Waldecker. I was born in Aachen in 1979 and I grew up in northern Germany.
Academic positions
 Since March 2015 Professor for Algebra at the Martin Luther University HalleWittenberg.
 Oktober 2009  Februar 2015 Junior professor for groups and geometries at the University of Halle (Germany).
 May 2007  September 2009 Research Fellow at the University of Birmingham,funded by the Leverhulme Trust, on a grant with Paul Flavell.
 January  April 2007 Honorary Lecturer at the University of Birmingham, School of Mathematics.
 Habilitation at the Martin Luther University HalleWittenberg (2014).
 PhD at the ChristianAlbrechtsUniversität zu Kiel (2007).
 2003  2006 PhD student at the ChristianAlbrechtsUniversität zu Kiel.
 Diplom (undergraduate degree) in Mathematics, Statistics und Econometrics at the ChristianAlbrechtsUniversity of Kiel (2003).
Rebecca Waldecker  Professor
for Algebra
Research
Most of my research comes from questions about the structure of finite groups. I am particularly interested in socalled local methods and results related to the Classification of Finite Simple Groups (CFSG) and in appli cations of group theoretic results. Therefore a part of my work is dedicated to refining and extending existing methods as well as developing new tech niques in abstract group theory. An increasing amount of time goes into answering questions from other mathematical areas that can be translated into group theoretic problems and then solved.
There are new projects related to computer algebra software: For example, joint work with Markus Pfeiffer and Chris Jefferson is improving search algorithms for permutation groups.
Manuscripts:
 Towards the Z*_3Theorem,
with Imke Toborg. Submitted.
 Balance and strongly pembedded subgroups, with Imke Toborg. Submitted.
 The refinement quality of orbital graphs, with Paula Hähndel. Submitted.
 Transitive permutation groups with
trivial five point stabilizers, with Kay Magaard and Barbara Baumeister. In preparation.
 Transitive permutation groups acting with fixity 4:
their 3structure and strongly pembedded subgroups,
with Kay Magaard und Barbara Baumeister. In revision.
 L9free groups, with Clemens Tietze und Imke Toborg. In preparation.
 Permutation group algorithms based on directed graphs, with
Chris Jefferson, Markus Pfeiffer and Wilf Wilson. In preparation.
Publications since 2015:
 The Sylow structure of transitive permutation groups acting with fixity 4,
with Barbara Baumeister und Kay Magaard.
Special issue in honor of Kay Magaard, Albanian J. Math. 12 (2018),
137145.
Available online.
 New refiners for permutation groups search,
with Chris Jefferson and Markus Pfeiffer.
Journal of Symbolic Computation 92 (2019), 7092.
Online version.
 Minimal and canonical images,
with Chris Jeﬀerson, Eliza Jonauskyte and Markus Pfeiﬀer.
Journal of Algebra 521 (2019), 481506.
Online here.
 Questions on orbital graphs,
with Paula Hähndel.
In: Davenport J., Kauers M., Labahn G., Urban J. (eds) Mathematical Software  ICMS 2018.
Lecture Notes in Computer Science, vol 10931. Springer, Cham.
Here is the
online
version.
 Permutation groups where nontrivial elements have few fixed points, in "Finite Simple Groups: Thirty Years of the Atlas and Beyond", herausgegeben von M. Bhargava, R. M. Guralnick, G. Hiss, K. Lux and P. H. Tiep. Contemporary Mathematics 694, AMS (2017), 223229.
 RempeGillen, Lasse and Waldecker, Rebecca, Primzahltests für Einsteiger, 2nd edition. Springer, 2015.
 Magaard, Kay und Waldecker, Rebecca, Transitive permutation groups with trivial four point stabilizers, J. Group Theory 18 (2015), no. 5, 687740.
 Pölzing, Juliane and Waldecker, Rebecca, M9free groups, J. Group Theory 18 (2015), 155190.
 Magaard, Kay and Waldecker, Rebecca, Transitive permutation groups where nontrivial elements have at most two fixed points, Journal of Pure and Applied Algebra 219, Issue 4 (2015), 729759.
Publications before 2015 can be found here.
Funding:
 Funding from the VolkswagenStiftung (20182019) for a summer school on "Constructive Matrix Group Recognition in GAP", with Alice Niemeyer.
 Grant for a summer school at the Institute MittagLeffler (Stockholm) with Cheryl Praeger and Donna Testerman.
 Project funded by the VolkswagenStiftung (20182019) for "Exploring Graph Backtracking".
 Cheryl Praeger Visiting Research Fellowship 2017 (stay at the UWA).
 DFG grants 2013, 2014 and 2016.
 Funding for conferences.
 MercatorProfessorship for Chris Parker (2011) with Gernot Stroth.
 2007 Conference Grant from the London Mathematical Society.
 20032006 Grant from the Studienstiftung des deutschen Volkes for postgraduate students.
 2002 Grant from the DAAD for a short term visit in Paris.
 19982003 Grant from the Studienstiftung des deutschen Volkes for undergraduate students.
Rebecca Waldecker 
Professor for Algebra
Teaching
Here is a list of courses that I teach frequently:
Linear Algebra, Algebra, Galois theory, Group theory, representation theory, coxeter groups and chamber systems, number theory, special topics in group theory.
Many of them have accompanying workshops, audio files of the lectures and, more recently, podcasts. There are also sporadic workshops on other topics, often from a more philosophical perspective or with advice for students.
I am happy about suggestions for workshop topics or podcasts!
Summary of teaching experience before 2010
For my teaching page in German and more information please go to my German webpage and then to "Lehre".
Rebecca Waldecker 
Professor for Algebra
Supervision
Students who are intersted in algebraic topics can work
on projects with me for a qualification thesis (Bachelor, Master, PhD),
and I also have PostDoc projects.
At the Bachelor thesis level the topics can vary from number theory or aspects of graph theory to Galois theory or, of course, group theory, also with computational or historical aspects or related to representation theory. More advanced work with me (e.g. Master thesis) has to be in group theory and needs some background knowledge from advanced courses.
More information and examples for topics of theses can be found on my German page at "Betreuung".
At the Bachelor thesis level the topics can vary from number theory or aspects of graph theory to Galois theory or, of course, group theory, also with computational or historical aspects or related to representation theory. More advanced work with me (e.g. Master thesis) has to be in group theory and needs some background knowledge from advanced courses.
More information and examples for topics of theses can be found on my German page at "Betreuung".
Rebecca Waldecker 
Professor for Algebra
The young group theorists conference "Grüppchen"
The "Grüppchen" is a conference for young group theorists that takes place once a year, alternatingly between Halle and Gießen. The talks are mostly in German. For more information please visit my German homepage and look at "Das Grüppchen".
Rebecca Waldecker 
Professor for Algebra
Activities
Here are some activities, just email me in case of any questions!
 Coaching of students and young researchers.
 School visits and presentations, information at open days, support of mathematics teachers.
 Workshops on mathematical topics and on topics related to coaching and teaching.
 Audio files for my lectures and podcasts on special questions.
 Projects for students in their first year to help overcome transition problems from school to university.
 Newsletter of the Maths Institute.
 Liaison person for the German Academic Scholarship Foundation since 2012.
 Vice president of the German Association of University Professors and Lecturers since 2016.
 Head of the Maths Institute since 2015.
 Active member of several faculty and university committees.
 Local organiser of the Northern German Group Theory Colloquium and the HalleJenaSeminar in Algebra.
 Coorganiser of the Young Group Theorists Conference ("Grüppchen") and the Summer School on Finite Groups and Related Geometrical Structures.
Rebecca Waldecker 
Professor for Algebra
Conferences
Talks since 2014
2019:
2019:

"Isolated elements in finite groups"
at the conference
"Group Theory in Berlin" in Berlin,
20th September 2019.
 "Groups acting with low fixity: status and plans" at the meeting "Groups and representations: A conference in memory of Kay Magaard" in Warwick (UK), 11th September 2019.
 "Towards a Z*_pTheorem" at the Workshop "groups and Geometries" in Banff (Kanada), 27th August 2019.
 Spotlight lecture "One question, two perspectives, three projects" at the summer school "Modern theory of group actions and the special role of finite simple groups", MittagLeffler Institute (Stockholm), 6th June 2019.
 Plenary talk "Kanonische Bilder" at a Computeralgebra conference in Kassel, 18th May 2019.
 "The four fixed points project" at the Northern German Group Theory Colloquium in Braunschweig, 29th June 2018.
 OSCARWorkshop at the MPI Leipzig, 12th Dezember, "Orbital graphs".
 NikolausKonferenz in Aachen, 8th Dezember, "Orbital graphs".
 Oberseminar Algebra at the RWTH Aachen, 7th Dezember 2017, "Unterwegs zum Z*_3Satz".
 Lecture Series for the Modern Mathematics International Summer School in Bremen, 7th  9th July, "Permutation groups".
 "Snowflakes, viruses and algorithms" Mathematics and Statistics Colloquium at the UWA (Perth), 16th March.
 "Orbital graphs" at the Groups and Combinatorics Seminar, UWA (Perth), 10th March.
 "Finding and using symmetry", Mathematics Seminar at the University of Dundee, 8th August.
 Talk at Conference "Group Theory, Geometry and the Influence of Jacques Tits" in Karlsruhe, 27th May: "Towards a Z*_3Theorem".
 NBSANMeeting: "Applying permutation group theory" at the University of St Andrews, 18th March.
 CIRCASeminar "Fixity and subgroup structure" at the University of St Andrews, 26th August.
 Lecture Series for the Modern Mathematics International Summer School in Bremen, 4th  9th July, on Coxeter chamber systems.
 Inaugural lecture "Was sind und was können Gruppen?" at the MartinLutherUniversität HalleWittenberg, 21th May.
 Talk at the Workshop "Algorithms for Linear Groups" in Banff, 20the November: "Permutation groups where nontrivial elements have few fixed points".
 Lecture Series for the Modern Mathematics International Summer School in Lyon, 22nd  29th August, on the topics group theory and primality testing.
 Talk at the MartinLutherUniversität HalleWittenberg, 24th July, for the application to a professorship: "Permutation groups and Riemann Surfaces".
 Mathematics Colloquium at the MartinLutherUniversität HalleWittenberg, 3rd July: "Permutation groups working hard".