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cs.DM2026
Cycles of Well-Linked Sets II: an Elementary Bound for the Directed Grid Theorem
Meike Hatzel, Stephan Kreutzer, Marcelo Garlet Milani +1
In 2015, Kawarabayashi and Kreutzer proved the Directed Grid Theorem - the generalisation of the well-known Excluded Grid Theorem to directed graphs - confirming a conjecture by Re…
cs.DM2025
Well-Quasi-Ordering Eulerian Digraphs Embeddable in Surfaces by Strong Immersion
Dario Cavallaro, Ken-ichi Kawarabayashi, Stephan Kreutzer
We prove that for every surface , the class of Eulerian directed graphs that are Eulerian embeddable into (in particular they have degree at most ) is well-quasi-ordered…
cs.DM2025
The Directed Disjoint Paths Problem with Congestion
Matthias Bentert, Dario Cavallaro, Amelie Heindl +3
The classic result by Fortune, Hopcroft, and Wyllie [TCS~'80] states that the directed disjoint paths problem is NP-complete even for two pairs of terminals. Extending this well-kn…