Information
The Tohoku Knot Seminar began in May 2000 as a low–dimensional topology seminar organized by knot theory researchers affiliated with universities in the Tohoku region, starting at Yamagata University. Since transitioning to a research meeting in 2001, it has been held almost annually, attracting participants from across the country. The age range of speakers spans from budding young researchers to prominent mid–career and veteran researchers, creating a unique atmosphere where the distance between speakers and the audience is very close. It has established itself as a comprehensive research meeting on knot theory. It is the only knot theory research meeting in the Tohoku and Hokuriku regions, providing valuable opportunities for university and graduate students in these areas to engage with knot theory research. In 2014, Akita University was added as a venue, and in 2019, Kanazawa University joined. The venues are rotated annually among Yamagata University, Akita University, and Kanazawa University.
Each meeting features a wide variety of presentations, including topics on 1–dimensional and 2–dimensional knot theory, knot theory related to DNA analysis, handlebody link theory, spatial graph theory, and 3– and 4–dimensional manifold theory, fostering fruitful discussions. This year, we aim to broadly invite presentations from researchers in low–dimensional topology. In addition to the latest achievements in knot theory research, we plan to include survey presentations on topics that many researchers should understand and talks on applications of knot theory in other natural science fields where it is currently applied or expected to be applied, striving to make the meeting fruitful.
Date
Friday, October 17 – Sunday, October 19, 2025 (JST)
Venue
TOKYO ELECTRON House of Creativity 3F, Lecture Theater, Katahira Campus, Tohoku University [Access]
Capacity
Onsite: 60
Organizers
Teruhisa Kadokami (Kanazawa University)
Yasuharu Nakae (Akita University)
Megumi Hashizume (Akita University)
Hiroshi Matsuda (Yamagata University)
Sonia Mahmoudi (Tohoku University)
Invited Speakers
Nobutaka Asano (National Institute of Technology, Tsuyama College)
Keisuke Himeno (Graduate School of Advanced Science and Engineering, Hiroshima University)
Kazuhiro Ichihara (College of Humanities and Sciences, Nihon University)
Nobuo Iida (Tokyo Woman’s Christian University)
Ayumu Inoue (Tsuda University)
Kouta Ishifuji (Yamagata University)
Tetsuya Ito (Kyoto University)
Yuichiro Iwamoto (Shinshu University)
Teruhisa Kadokami (Kanazawa University)
Mizuki Kikuya (Department of Mathematics, Ochanomizu University)
Naoki Kimura (Tokyo University of Science)
Yuya Kodama (Kagoshima University)
Hisatoshi Kodani (Institute of Mathematics for Industry, Kyushu University)
Fukuda Mizuki (Hiroshima University, WPI-SKCM2)
Takayuki Morifuji (Keio University)
Yukihiro Okamoto (Tokyo Metropolitan University)
Miora Saito (Department of Mathematics, Ochanomizu University)
Megumi Tasaki (Department of Mathematics, Ochanomizu University)
Sohei Tateno (Nagoya University)
Yoshiaki Uchida (Kobe Pharmaceutical University)
Jumpei Yasuda (Osaka Metropolitan University)
Registration
MAIL to: tms2025*math.akita–u.ac.jp (change * to @)
Time Schedule
- Friday, October 17, 2025
- 13:30 – 14:00
- Sohei Tateno (Nagoya University)
- An analogue of non–commutative Iwasawa theory for fibered knots
- 14:10 – 14:40
- Hisatoshi Kodani (Institute of Mathematics for Industry, Kyushu University)
- Kontsevich invariant and Galois action for 2–component string links
- 14:50 – 15:20
- Kouta Ishifuji (Yamagata University)
- Stability of Khovanov Homology for Garside Elements
- 15:40 – 16:10
- Miora Saito (Department of Mathematics, Ochanomizu University)
- On 2–adjacency of 2–bridge links
- 16:20 – 16:50
- Megumi Tasaki (Department of Mathematics, Ochanomizu University)
- Bounds on the area of celtic knots
- 17:00 – 17:30
- Mizuki Kikuya (Department of Mathematics, Ochanomizu University)
- Construction and Characterization of Polyhedral Links
- Saturday, October 18, 2025
- 09:20 – 09:50
- Nobuo Iida (Tokyo Woman’s Christian University)
- On the slice–torus invariant qM from Z2 equivariant Seiberg–Witten theory
- 10:00 – 10:30
- Yukihiro Okamoto (Tokyo Metropolitan University)
- On knot types of clean Lagrangian intersections
- 10:50 – 11:20
- Keisuke Himeno (Graduate School of Advanced Science and Engineering,Hiroshima University)
- The unoriented band unknotting number of torus knots
- 11:30 – 12:00
- Yuya Kodama (Kagoshima University)
- Metrics for quandles
- 13:30 – 14:00
- Yuichiro Iwamoto (Shinshu University)
- Generating sets of Reidemeister moves
- 14:10 – 14:40
- Tetsuya Ito (Kyoto University)
- Ma–Qiu index in knot theory
- 14:50 – 15:20
- Teruhisa Kadokami (Kanazawa University)
- The half Alexander polynomials of amphicheiral 2–bridge knots
- 15:40 – 16:10
- Takayuki Morifuji (Keio University)
- On TAV groups and the TAV order function of knots
- 16:20 – 16:50
- Kazuhiro Ichihara (College of Humanities and Sciences, Nihon University)
- Degeneracy slopes, boundary slopes and exceptional surgery slopes
- 17:00 – 17:30
- Yoshiaki Uchida (Kobe Pharmaceutical University)
- Simple ribbon knots obtained by the product of torus knots (joint with T. Shibuya (Osaka institute of technology))
- Sunday, October 19, 2025
- 09:20 – 09:50
- Ayumu Inoue (Tsuda University)
- Both of the 2–twist–spun 52–knot and the 4–twist–spun trefoil have the triple point number eight
- 10:00 – 10:30
- Jumpei Yasuda (Osaka Metropolitan University)
- Suciu’s ribbon knots and their knot quandles
- 10:50 – 11:20
- Naoki Kimura (Tokyo University of Science)
- A numerical invariant and Legendrian embeddings of non–intrinsically
knotted graphs
- 11:30 – 12:00
- Fukuda Mizuki (Hiroshima University, WPI–SKCM2)
- Alexander ideals of branched twist roll spun knots
- 12:10 – 12:40
- Nobutaka Asano (National Institute of Technology, Tsuyama College)
- A classification of certain Stein surfaces with genus–2 relative trisections (joint work with Natsuya Takahashi (The University of Osaka))
Supported by
JSPS KAKENHI Grant Numbers 21H04428, 23K20791 and 25K17246.
Co–hosted by
Tohoku Forum for Creativity, Tohoku University
Mathematical Science Center for Co–creative Society, Tohoku University
Contact
Email: tms2025*math.akita–u.ac.jp (change * to @)