Fachbereich Mathematik
FachbereichMathematik
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Raphael W. Jacobs
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Fachbereich Mathematik Bereich DM Bundesstraße 55 (Geomatikum) 20146 Hamburg |
Raum 232 Tel.: +49 40 42838-5159 E-Mail: raphael.jacobs (at) uni-hamburg.de Office hours: by appointment |
About me
I am a 5th year PhD student working in structural graph theory under the supervision of Reinhard Diestel. My main research interests include tangles, decompositions of graphs, graph minors and connectivity.
Research
- Locally chordal graphs (with Tara Abrishami, Paul Knappe and Jonas Kobler), 2025. (arXiv)
- Canonical graph decompositions and local separations: From infinite coverings to a finite combinatorial theory (with Johannes Carmesin, Paul Knappe and Jan Kurkofka), 2025. (arXiv)
- Hitting cycles through prescribed vertices or edges (with Nathan Bowler, Ebrahim Ghorbani, Florian Gut and Florian Reich), 2024, submitted. (arXiv)
- On vertex sets inducing tangles (with Sandra Albrechtsen, Hanno von Bergen, Paul Knappe and Paul Wollan), 2024, submitted. (arXiv)
- A characterisation of graphs quasi-isometric to K4-minor-free graphs (with Sandra Albrechtsen, Paul Knappe and Paul Wollan), 2024, submitted. (arXiv)
- Linked tree-decompositions into finite parts (with Sandra Albrechtsen, Paul Knappe and Max Pitz), 2024, submitted. (arXiv)
- Counterexamples regarding linked and lean tree-decompositions of infinite graphs (with Sandra Albrechtsen, Paul Knappe and Max Pitz), 2024, submitted. (arXiv)
- A structural duality for path-decompositions into parts of small radius (with Sandra Albrechtsen, Reinhard Diestel, Ann-Kathrin Elm, Eva Fluck, Paul Knappe and Paul Wollan), 2023. (arXiv)
- Menger's Theorem in bidirected graphs (with Nathan Bowler, Ebrahim Ghorbani, Florian Gut and Florian Reich), 2023. (arXiv)
- The induced two paths problem (with Sandra Albrechtsen, Tony Huynh, Paul Knappe and Paul Wollan), SIAM Journal on Discrete Mathematics, Volume 38, Issue 2, Pages 1438-1450. (Journal, arXiv)
- Efficiently distinguishing all tangles in locally finite graphs (with Paul Knappe), Journal of Combinatorial Theory, Series B, Volume 167, Pages 189-214. (Journal, arXiv)
- A grid theorem for strong immersions of walls (with Reinhard Diestel, Paul Knappe and Paul Wollan), Journal of Graph Theory. (Journal, arXiv)
- Canonical graph decompositions via coverings (with Reinhard Diestel, Paul Knappe and Jan Kurkofka), 2022, submitted. (arXiv)
- The Lovász-Cherkassky theorem for locally finite graphs with ends (with Attila Joó, Paul Knappe, Jan Kurkofka and Ruben Melcher), Discrete Mathematics, Volume 346, Issue 12, 113586. (Journal, arXiv)
- Point sets and functions inducing tangles of set separations (with Reinhard Diestel and Christian Elbracht), Journal of Combinatorics, Volume 15, Number 3, Pages 283-306. (Journal, arXiv)
Theses
- How to build a tree of tangles by local refinements, 2020, MSc dissertation. (PDF)
Teaching
- Summer semester 2023: Exercise class to Graph Theory I by Nathan Bowler.
- Winter semester 2020/21: Exercise class to Mathematics I for Computer Scientists by Stefan Geschke.