Presentations at conferences, workshops or seminars

2020
Even Circuits in Oriented Matroids
Discrete Math Seminar (online) 09.12.2020, IBS Discrete Mathematics Group, Daejeon, Korea.
Picturing the undrawable: Visualization of infinites in mathematics education and set theoretic practice
9th Budapest Visual Learning Conference 26.11.2020, online conference; joint talk with D. Sarikaya.
Tilings as an open problem field for mathematically gifted children)
9th Budapest Visual Learning Conference 26.11.2020, online conference; joint talk with D. Sarikaya.
Hamiltonicity in locally finite graphs
Graph Theory seminar (online) 03.11.2020 and 24.11.2020, University of West Bohemia, Czech Republic.
Eine informelle Vorstellung der WSG (in German)
7. Herbsttagung des Arbeitskreises Problemlösen der Gesellschaft für Didaktik der Mathematik 07.10. – 08.10.2020, online conference; joint talk with D. Sarikaya.
Polymath für mathematisch begabte Kinder: Kollaboration während der COVID-19-Krise (in German)
7. Herbsttagung des Arbeitskreises Problemlösen der Gesellschaft für Didaktik der Mathematik 07.10. – 08.10.2020, online conference; joint talk with B. Rott and D. Sarikaya.
Characterising the existence of odd dijoins via cut minors
DMV annual meeting 14.9. – 17.9.2020, TU Chemnitz, online conference.
Tilings as an open problem field for mathematically gifted children
Minisymposium “Mathematics and Arts” at DMV annual meeting 14.9. – 17.9.2020, TU Chemnitz, online conference; joint talk with D. Sarikaya.
Adapting Polymath for mathematically gifted children: collaborating during the COVID-19 crisis
DMV annual meeting 14.9. – 17.9.2020, TU Chemnitz, online conference; joint talk with D. Sarikaya.
Analogical Results as Data for Theory Choice in Mathematical Research: The case of infinite Graph Theory
DMV annual meeting 14.9. – 17.9.2020, TU Chemnitz, online conference; joint talk with D. Sarikaya.
How the tangible gets abstracts and vice versa: Experience from classes with mathematically gifted youth
International meeting of the APMP 18.01. – 21.01.2020, ETH Zurich, Zurich, Switzerland.
2019
Characterising k-connected sets in infinite graphs
Colloquium on Combinatorics (Kolkom) 8.11. – 9.11.2019, University of Paderborn, Paderborn, Germany.
How do we decide which mathematics is valuable: Empirical findings and philosophical thoughts
Novembertagung on the History and Philosophy of Mathematics 31.10. – 02.11.2019, Strasbourg, France; joint talk with D. Sarikaya.
Is a definition normative?
Novembertagung on the History and Philosophy of Mathematics 31.10. – 02.11.2019, Strasbourg, France; joint talk with D. Sarikaya.
Characterising k-connected sets in infinite graphs
DMV Annual meeting 23.9. – 26.9.2019, Karlsruhe Institute of Technology, Karlsruhe, Germany.
How to find suitable problems for mathematically gifted students within enrichment courses
DMV Annual meeting 23.9. – 26.9.2019, Karlsruhe Institute of Technology, Karlsruhe, Germany; joint talk with D. Sarikaya.
Forcing Hamiltonicity in locally finite graphs via forbidden induced subgraphs
Colourings, Independence and Domination (CID) 15.09. – 20.09.2019, Piechowice, Poland.
Constructing a uniquely Hamiltonian infinite graph all whose vertices and ends have degree 3
28th Workshop on Cycles and Colourings (C&C) 01.09. – 06.09.2019, Nový Smokovec, Slovakia.
Variations in open problem fields as a tool for mathematical education: from basics to open questions in 90 minutes
11th International Mathematical Creativity and Giftedness Conference (MCG11) 22.08. – 24.08.2019, Hamburg, Germany; joint workshop with D. Sarikaya.
Text-driven variation as a vehicle for generalisation, abstraction, proofs and refutations: an example about tilings and Escher within mathematical education
16th International Congress on Logic, Methodology and Philosophy and Technology (CLMPST) 05.08. – 10.08.2019, Prague, Czech Republic.
The development of epistemic objects in mathematical practice: Shaping the infinite realm driven by analogies from finite mathematics in the area of Combinatorics
16th International Congress on Logic, Methodology and Philosophy and Technology (CLMPST) 05.08. – 10.08.2019, Prague, Czech Republic.
Progress on the Ubiquity Conjecture
27th British Combinatorial Conference 29.07. – 02.08.2019, Birmingham, United Kingdom.
Variations in open problem fields as a tool for mathematical education: From basics to open questions in the twinkling of an eye
4th Interdisciplinary Scientific Conference Mathematical Transgressions 13.03. – 16.03.2019, Cracow, Poland; joint talk with D. Sarikaya.
2018
Analogical Results as Data for Theory Choice in Mathematical Research: The case of infinite Graph Theory
Analogical Reasoning in Science and Mathematics 26.10. – 28.10.2018, Ludwig-Maximilians University, Munich, Germany; joint talk with D. Sarikaya.
The Infinite Lucchesi-Younger Conjecture
GT2018 29.08. – 01.09.2018, Nyborg, Denmark.
2017
Geodesic cuts
Structure in Graphs and Matroids (SiGMa) 17.07. – 21.07.2017, University of Waterloo, Ontario, Canada.
2015
Forcing Hamilton cycles in infinite graphs
DMV Annual meeting 21.9. – 25.9.2015, University of Hamburg, Germany.