I am a PhD student at the University of Amsterdam under supervision of Alexander Schrijver. I am interested in applying methods from algebra, geometry and representation theory to problems in discrete mathematics. My main interests center around the representation theory and combinatorics of the symmetric group, code bounds in coding theory using semidefinite programs and flow theory for (embedded) graphs. I am funded by an ERC Advanced Grant (AFMIDMOA).
Contact information
b dot m dot litjens at uva dot nl
+31 (0)20 525 8206
Room F3.28
Kortewegde Vries Institute for Mathematics
University of Amsterdam
Science Park 107
Postbus 94248
1090 GE Amsterdam
Supervising
Bachelor's thesis 
Semester 
Student 
Coding theory 
Spring 2017 
Eline Filius 



Second year project 
Semester 
Students 
Roots of the independence polynomial 
Spring 2017 
Joris Blok, Fjodor van Hoof 
Group cohomology and group extensions 
Spring 2016 
Dimitri Geelhoed, Manuel Van 
Sylow theorems and classification of finite groups 
Spring 2016 
Emma van der Grijp, Yvette van Nek 
Rational points on elliptic curves 
Spring 2015 
Wouter de Koning, Ugur Taytas 
Talks
Conference/Seminar 
Topic 
Date 
Place 
Eurocomb 2017 
A Tutte polynomial for maps Slides 
192017 
Vienna, Austria 
Weekly Seminar Discrete Math. group 
A theorem on perfect codes Notes 
3152017 
UvA/CWI, Amsterdam 
Workshop Analytic Combinatorics 
Counting flows in embedded graphs Slides 
3132017 
Zamecek, Czech Republic 
Weekly Seminar Discrete Math. group 
The FrobeniusSchur indicator 
2232017 
UvA/CWI, Amsterdam 
Weekly Seminar Discrete Math. group 
Kneser's Conjecture and the BorsukUlam Theorem 
29112016 
UvA/CWI, Amsterdam 
Master Seminar in Algebra and Geometry 
Counting solutions of equations in finite groups Notes 
28112016 
UvA, Amsterdam 
Workshop on Algebraic Graph Theory 
Semidefinite bounds for mixed binary/ternary codes Slides 
6102016 
Pilsen, Czech Republic 
Weekly Seminar Discrete Math. group 
Partition functions from representations and flowcoloring duality for embedded graphs 
2092016 
UvA/CWI, Amsterdam 
5th SDP Day 
New upper bounds for mixed and nonbinary codes based on triples and quadruples Slides 
3062016 
CWI, Amsterdam 
JCCA 2016 
New upper bounds for nonbinary codes based on quadruples Slides 
2452016 
Kyoto University, Japan 
Weekly Seminar Discrete Math. group 
Kirchoff polynomials and a conjecture of Kontsevich 
1542016 
UvA/CWI, Amsterdam 
Weekly Seminar Discrete Math. group 
Counting solutions of equations in finite groups 
812016 
UvA/CWI, Amsterdam 
Weekly Seminar Discrete Math. group 
Code upper bounds and semidefinite programming 
30102015 
UvA/CWI, Amsterdam 
Weekly Seminar Discrete Math. group 
Algebraic matroids 
2662015 
UvA/CWI, Amsterdam 
Weekly Seminar Discrete Math. group 
Repr. theory of the symmetric group, after Okounkov and Vershik 
2952015 
UvA/CWI, Amsterdam 
Weekly Seminar Discrete Math. group 
Graph groups 
1842015 
UvA/CWI, Amsterdam 
Weekly Seminar Discrete Math. group 
Knot theory and Vassiliev invariants 
21112014 
UvA/CWI, Amsterdam 
Weekly Seminar Discrete Math. group 
SchurWeyl duality and the FFT for GL(n,C) 
1992014 
UvA/CWI, Amsterdam 
Master thesis presentation 
Good reduction of abelian varieties 
2242014 
UvA/VU, Amsterdam 
Syzygien in der algebraischen Geometrie 
CastelnuovoMumford regularität 
1872013 
FU, Berlin 
padischen Galois Darstellungen 
Galoiskohomologie 
262013 
HU, Berlin 
Teaching
Courses 
Semester 
Representation theory 
Autumn 2017 
Graph theory 
Spring 2017 
Linear algebra 
Autumn 2016 
Algebra 1 (group theory) 
Spring 2016 
Algebra 2 (ring and field theory) 
Autumn 2015 
Matching Wiskunde (introduction to analysis) 
Summer 2015 
Algebra 1 (group theory) 
Spring 2015 
Algebra 2 (ring and field theory) 
Autumn 2014 
Algebra 2 (ring and field theory) 
Autumn 2013 
Writing
In preparation
A.J. Goodall, B.M. Litjens, G. Regts and L. Vena Cros, A Tutte polynomial for nonorientably embedded graphs
Preprints
B.M. Litjens, S.C. Polak and V. Sivaraman, Sumperfect graphs. (2017; preprint arXiv:1710.07546)
B.M. Litjens, On dihedral flows in embedded graphs. (2017; preprint arXiv:1709.06469)
B.M. Litjens, Semidefinite bounds for mixed binary/ternary codes. (2016; preprint arXiv:1606.06930)
Accepted
B.M. Litjens and B.L. Sevenster, Partition functions and a generalized coloringflow duality for embedded graphs, (2017;
arXiv:1701.00420, to appear in
Journal of Graph Theory DOI: 10.1002/jgt.22210)
Published
B.M. Litjens, S.C. Polak and A. Schrijver, Semidefinite bounds for nonbinary codes based on quadruples. Designs, Codes and Cryptography, 84 (1) (2017), 87100. Journal, arXiv:1602.02531
Refereed conference proceedings
A.J. Goodall, B.M. Litjens, G. Regts and L. Vena Cros, A Tutte polynomial for nonorientable maps. Electronic Notes in Discrete Mathematics, 61 (2017), 513510 Journal
Thesis
My master thesis, titled `Good reduction of abelian varieties', was written under the supervision of Gerard van der Geer.
arXiv ·
Google scholar ·
ORCID ·
ResearchGate ·
UvA