### What is TGT

Topological Graph Theory is one of the most interesting research areas in graph theory, related to Four Color Theorem, a celebrated theorem in the 20th century mathematics. Seiya Negami is a pioneer of the research area in Japan, and he started a workshop on topological graph theory at Yokohama National University in 1989, which was a small meeting with only five or six speakers. This was the 1st Workshop on Topological Graph Theory (TGT), and the origin of the long standing academic event in our university.

From 1989 to 2022, we have continued to organize TGT annually. They are almost domestic and many students presented their results there, but we had four memorial ones as international conference, which were the 10th in 1998, 20th in 2008, 25th in 2013, and 30th in 2018.

In the past few years, face-to-face meetings have been strictly limited, in part due to COVID-19. However, the situation is improving, and we should resume the exchanges as before. Therefore, for this 35th memorial, we have decided to hold this international workshop with four plenary speakers.

### Organizing Committee:

- Atsuhiro Nakamoto (Yokohama National University)
- Kenta Ozeki (Yokohama National University)
- Naoki Matsumoto (University of the Ryukyus)
- Kenta Noguchi (Tokyo University of Science)

Sponsored by

Faculty of Environment and Information Sciences, Yokohama National University