Julian Ritter | |
■ | Summary |
---|---|
I am a combinatorialist.
I completed my Ph.D. at
École polytechnique under the supervision of
Vincent Pilaud in 2021.
My research interests lie mainly in discrete geometry and polyhedral combinatorics.
I am particularly interested in hyperplane arrangements,
their posets of regions
and polytopes associated to them.
I’m not an expery on the theory of numbers, but here are some special ones: My Erdős number is 4, via Martin Aigner, Günter M. Ziegler and Arnau Padrol, from all of whom I was fortunate to learn in person. Coincidentally, my Carlsen number is ♔#4 as well. My Bacon number, on the other hand, is still ∞. | |
■ | Publications |
2022 |
»Shard Polytopes«
International Mathematics Research Notices Preprint on arXiv.org joint work with Arnau Padrol and Vincent Pilaud |
2021 |
»Removahedral Congruences Versus Permutree Congruences«
Electronic Journal of Combinatorics, vol. 28 (2021) no. 4 Preprint on arXiv.org joint work with Doriann Albertin and Vincent Pilaud |
2018 |
»Ranking the Teams in European Football Leagues with Agony«
Machine Learning and Data Mining for Sports Analytics, conference proceedings joint work with Stefan Neumann and Kailash Budhathoki |
■ | Theses |
2021 |
»Shard Polytopes and Quotientopes for Lattice Congruences of the Weak Order«
Ph.D. thesis supervised by Vincent Pilaud |
2016 |
»The Polytopes of Cardinality Homogeneous Set Systems«
Master’s thesis (PDF) supervised by Günter M. Ziegler |
2015 |
»Vehicle Routing Problems with Profits«
Bachelor’s thesis (PDF) supervised by Ralf Borndörfer |
■ | Teaching |
2021/22 |
Mathematik I
Lectures and exercise sessions Technische Hochschule Brandenburg, Germany |
2020/21 |
Mathematik I
Lectures and exercise sessions Technische Hochschule Brandenburg, Germany |
2019 |
INF411 – Les bases de la programmation et de l’algorithmique
Exercise sessions and tutorial sessions École polytechnique, France |
2019 |
INF361 – Introduction à l’informatique
Exercise sessions École polytechnique, France |
2018 |
INF411 – Les bases de la programmation et de l’algorithmique
Exercise sessions École polytechnique, France |
2018 |
INF311 – Introduction à l’informatique
Exercise sessions École polytechnique, France |
2018 |
CSE103 – Introduction to Algorithms
Tutorial sessions École polytechnique, France |
■ | Talks (selection) |
2022 |
»Shard Polytopes«
Summary, Slides FPSAC 2021, Bar-Ilan University |
2021 |
»Shard Polytopes and Quotientopes for Lattice Congruences of the Weak Order«
PhD thesis defense, online |
2021 |
»Shard Polytopes«
Discrete Geometry Student Seminar, Freie Universität Berlin |
2021 |
»Introduction aux arrangements, aux tessons et aux arcs«
Séminaire DGeCo, Sorbonne Université, Paris |
2019 |
»Towards Type B Quotientopes«
AGDM Seminar, Technische Universität Wien |
2019 |
»Some Hyperplane Arrangements, Some Posets and Some Polytopes«
Working seminar Discrete Geometry group, Freie Universität Berlin |
2018 |
»The Poset of Regions of a Hyperplane Arrangement«
Combinatorics Working Seminar, Universität Wien |
2017 |
»Le tirage au sort des huitièmes de finale de la ligue des champions«
Plateau Saclay Combinatorics Seminar, École polytechnique, France |
2016 |
»Solving Periodic Event Scheduling Problems Efficiently by Reducing to SAT«
Summary, Slides Student seminar »Periodic Timetabling and Passenger Routing«, Zuse-Institut Berlin |
2016 |
»Improving Accessibility After a Disaster«
Summary Student seminar »Network Interdiction Problems«, Freie Universität Berlin |
■ | Conferences attended |
2019 |
»Einstein Workshop on Polytopes and Algebraic Geometry« Freie Universität Berlin, Germany |
2019 |
»Hyperplane Arrangements and Reflection Groups« Leibniz Universität Hannover, Germany |
2019 |
»Sage Days 100« Universität Bonn, Germany |
2019 |
»Summer School on Geometric and Algebraic Combinatorics« Sorbonne Université, Paris, France |
2019 |
»Free Computational Mathematics« CIRM Luminy, France |
2018 |
»Einstein Workshop on Algebraic Combinatorics« Technische Universität Berlin, Germany |
2018 |
»Einstein Workshop on Geometric and Topological Combinatorics« Freie Universität Berlin, Germany |
2018 |
Fall School »Order and Geometry« Gutshof Sauen, Germany |
2018 |
»Journées du groupe de travail CombAlg 2018«
Université de Paris 13, Villetaneuse, France |
2018 |
»6th Encuentro Colombiano de Combinatoria« Universidad del Norte, Barranquilla, Colombia |
2018 |
Journée « Football et data » Maison des X, Paris, France |
2018 |
»Journées Nationales de l’Informatique Mathématique 2018« École polytechnique, France |
2018 |
»Cluster Algebras: Twenty Years On« CIRM Luminy, France |
2018 |
»Polytopes à Paris 2018« Université Paris 6, France |
2017 |
»Journées de Géométrie Algorithmique 2017« Centre Paul Langevin, Aussois, France |
2017 |
Journée « Flips » Université Paris 13, France |
2017 |
»Two Cluster Days«
Université Paris 6, France |
2017 |
»Geometry and Combinatorics of Associativity« Trinity College, Dublin, Ireland |
■ | Math Journalism (selection) |
2017 |
»Gilt die Bauernregel des Fußballs noch?«
Zeit Online How many points will be necessary to avoid relegation from the Bundesliga? |
2016 |
»8 aus 47«
Zeit Online How does the UEFA Champions League draw work? |
2016 |
»Schluss mit Remis«
Zeit Online Why are there so many draws in chess? |
2016 |
»Nicht mal das kann die FIFA«
Zeit Online What’s wrong with the FIFA World Ranking? |
2015 |
»Die Tabelle lügt«
Fokus Fussball Are there better ways to calculate a league table? |
2015 |
»The Line-ups They Are a-Changin’«
Fokus Fussball How much do line-ups change over the course of a season? |
■ | Contact |
firstname dot lastname at nailuj dot de | |
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