Talks
★: an invited talk. ✈: an international conference.- ★November, 26th 2021(Japan), Multiple group racks and cocycle invariants of surfaces in the 3-sphere (joint work with Tomo MURAO), Quandles and Symmetric Spaces @Osaka City University Advanced Mathematical Institute (zoom).
- October, 15th 2021(Japan), Cocycles of oriented sufaces in the 3-shere, Tohoku Musubime Seminor @Akita University (zoom).
- ★February, 12th 2020(✈Japan), Oriented surfaces in the 3-sphere and their coloring invariants, The 15th East Asian Conference on Geometric Topology @Research Institute for Mathematical Science (Kyoto University).
- ★November, 11th 2019(✈China), Cocycles of G-Alexander biquandles and G-Alexander multiple conjugation biquandles, The 3rd Pan-Pacific International Conference on Topology and Applications @Xiangyu Hotel, Chengdu.
- July 1st, 2019(✈Japan), Compact surfaces in the 3-sphere and its coloring invariants, The 2nd Meeting on Spatial Graph Theory @Waseda University.
- June 30th, 2019, A combinatorial structure of surfaces embedded in the 3-sphere, The 93th Yonezawa Mathematics Seminor @Yamagata University．
- March 23rd, 2019(✈USA), A diagrammatic presentation of compact surfaces in the 3-sphere and its characterization, AMS Meeting Special Session on Algebraic and Combinatorial Structures in Knot Theory (Meeting #1147) @University of Hawaii at Manoa, Honolulu, HI.
- ★January 30th, 2018(✈Korea), Diagrammatic presentation and Reidemeister moves for every compact surface, The 13th East Asian School of Knots and Related Topics @Korea Advanced Institute of Science and Technology.
- December 26th, 2017, On a classification of compact surfaces in the 3-sphere, Musubime No Suugaku Ⅹ @Tokyo Woman's Christian University.
- ★October 8th, 2017, Surfaces embedded in the 3-sphere, Handlebody-knots and Related Topics 10 @University of Tsukuba.
- May 26th, 2017, The algebraic structure of a partially multiplicative biquandle, MSJ Spring Meeting 2017 @Tokyo Metropolitan University (joint work with Masahide IWAKIRI, Seiich KAMADA, Jieon KIM and Kanako OSHIRO).
- May 16th, 2016, Minors of multibranched surfaces, MSJ Spring Meeting 2016 @University of Tsukuba (joit work with Makoto OZAWA).
- October 24th, 2015(✈USA), Arrangements of spatial graphs on surfaces arranged in R3, AMS Meeting Special Session on Spatial graphs @California State University Fullerton.
- ★October 17th, 2015, Links on surfaces in the 3-sphere, Tokyo Woman's Christian University Topology Seminar @Tokyo Woman's Christian University.
- ★July 23rd, 2015, Links and surfaces, Seminar of Mathematics @National Institute of Technology, Ibaraki College.
- ★April 24th, 2015, Arrangements of links on surfaces arranged in Three dimensional Euclidean space, Friday Seminar on Knot Theory @Osaka City University.
- May 24th, 2015, Circle arrangements on spherical curves, MSJ Spring Meeting 2015 @Meiji University (joint work with Noboru ITO and Kouki TANITAMA).
- May 21st, 2015, Impossibility of embeddings for 2-dimensional complexes into 3-sphere, MSJ Spring meeting 2015 @Meiji University (joint work with Maokoto OZAWA).
- December 26th, 2014, An arrangement of links on surfaces in S3, Musubime No Suugaku Ⅶ @Tokyo Woman's Christian University.
- Nobember 15th, 2014, Impossibility of embeddings of 2-dimensional complexes into the 3-sphere, Tokyo Woman's Christian University Topology Seninar @Tokyo Woman's Christian University.
- September 28th, 2014, On arrangements of component-trivial links on planes, MSJ Autumn Meeting 2014 @Hiroshima University.
- September 14th, 2014, Topics on arrangements of links into a surface, Workshop 2014 on Mathematics and Mathematical Education @Nara University of Education.
- August 23rd, 2014(✈Korea), Plane number of Links, A Satellite Conference of Seoul ICM 2014 Knots and Low dimensional manifolds @BEXCO Convention & Exhibition Center II, Busan, Korea.
- ★July 11th, 2014, An arrangement of links into surfaces, The 7th floor Seminar @Waseda University.
- February 18th, 2014, A arrangement and the plane number of links, The 11th KINOSAKI SEMINAR @Kinosaki-cho Hyogo-ken.
- December 19th, 2013, On the plane number of some links, Musubime No Suugaku Ⅵ @Nihon University.
- August 21st, 2012, On 2-dimensional complices as hyper graphs, Workshop 2012 on Mathematics and Mathematical Education @Nara University of Education.
- June 27th, 2012, The multiplicity of graphs, The 86th Yonezawa Mathematics Seminar @Yamagata University.
- April 14th, 2012 The multiplicity of graphs on the real line R, Tokyo Woman's Christian University Topology Seminar @Tokyo Woman's Christian University.
- November 26th, 2011, Multiplicity of Graphs, The 23th Workshop on Topological Graph Theory @Yokohama National University.
- September 23rd, 2011, Multiplicity of Graphs, Workshop 2011 on Mathematics and Mathematical Education @Nara University of Education.