Loading Events

« All Events

  • This event has passed.
:

Raphael Steiner, Congruence-constrained subdivisions in digraphs

Wednesday, August 31, 2022 @ 4:30 PM - 5:30 PM KST

Zoom ID: 869 4632 6610 (ibsdimag)

I will present the short proof from [1] that for every digraph F and every assignment of pairs of integers (re,qe)eA(F) to its arcs, there exists an integer N such that every digraph D with dichromatic number at least N contains a subdivision of F in which e is subdivided into a directed path of length congruent to re modulo qe for every eA(F). This generalizes to the directed setting the analogous result by Thomassen for undirected graphs and at the same time yields a novel proof of his result. I will also talk about how a hypergraph coloring result from [2] may help to obtain good bounds on N in the special case when F is subcubic.

[1] https://arxiv.org/abs/2208.06358

[2] https://arxiv.org/abs/2206.13635

Details

Date:
Wednesday, August 31, 2022
Time:
4:30 PM - 5:30 PM KST
Event Category:
Event Tags:

Venue

Zoom ID: 869 4632 6610 (ibsdimag)

Organizer

O-joung Kwon (권오정)
IBS 이산수학그룹 Discrete Mathematics Group
기초과학연구원 수리및계산과학연구단 이산수학그룹
대전 유성구 엑스포로 55 (우) 34126
IBS Discrete Mathematics Group (DIMAG)
Institute for Basic Science (IBS)
55 Expo-ro Yuseong-gu Daejeon 34126 South Korea
E-mail: dimag@ibs.re.kr, Fax: +82-42-878-9209
Copyright © IBS 2018. All rights reserved.