YASUHARA, Akira

J-GLOBAL         Last updated: Nov 28, 2019 at 02:51
 
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Name
YASUHARA, Akira
E-mail
yasuharawaseda.jp
Affiliation
Waseda University
Section
School of Commerce
Degree
Ph. D(Waseda University)
Research funding number
60256625

Research Areas

 
 

Academic & Professional Experience

 
Apr 1993
 - 
Mar 1996
Research Assistant, Department of Mathematical Sciences, Tokyo Denki University
 
Apr 1996
 - 
Jun 1999
Assistant Professor, Faculty of Education, Tokyo Gakugei University
 
Jul 1999
 - 
Mar 2007
Associate Professor, Faculty of Education, Tokyo Gakugei University
 
Apr 2007
 - 
Jun 2011
Associate Professor, Faculty of Education, Tokyo Gakugei University
 
Jul 2011
 - 
Mar 2016
Professor, Faculty of Education, Tokyo Gakugei University
 
Apr 2016
 - 
Mar 2018
Professor, College of Liberal Arts, Tsuda University
 
Apr 2018
   
 
Professor, Faculty of Commerce, Waseda University
 

Education

 
Apr 1985
 - 
Mar 1989
Department of Mathematics, School of Education, Waseda University
 
Apr 1989
 - 
Mar 1991
Department of Mathematics, Master Program, Graduate School of Science and Engineering, Waseda University
 
Apr 1991
 - 
Mar 1993
Department of Mathematics, Doctoral Program, Graduate School of Science and Engineering, Waseda University
 

Published Papers

 
Haruko A. Miyazawa, Kodai Wada and Akira Yasuhara
Proceedings of the American Mathematical Society   147(8) 3595-3602   Aug 2019   [Refereed]
Jean-Baptiste Meilhan and Akira Yasuhara
Algebraic & Geometric Topology   19 397-456   Feb 2019   [Refereed]
The pass move is an unknotting operation for welded knots
Takuji Nakamura, Yasutaka Nakanishi, Shin Satoh b, Akira Yasuhara
247 9-19   Sep 2018   [Refereed]
Link invariants derived from multiplexing of crossings
Haruko Aida Miyazawa, Kodai Wada, Akira Yasuhara
18 2497-2507   Apr 2018   [Refereed]
Milnor invariants of covering links
Natsuka Kobayashi,Koudai Wada, Akira Yasuhara
Topology and its Applications   224 60-72   2017   [Refereed]

Misc

 
Jean-Baptiste Meilhan and Akira Yasuhara
Algebraic & Geometric Topology   14 1461-1488   Apr 2014
Jean-Baptiste Meilhan, Eri Seida and Akira Yasuhara
Topology and its Applications   160 836-843   Mar 2013
Jean-Baptiste Meilhan and Akira Yasuhara
Geometry & Topology   16(2) 889-917   May 2012
Yasutaka Nakanishi, Tetsuo Shibuya, Tatsuya Tsukamoto and Akira Yasuhara
Journal of Knot Theory and Its Ramifications   21 1250055 1-1250055 9   Jan 2012

Research Grants & Projects

 
Finding new mathematical knot theory using data compression
Project Year: Apr 2014 - Mar 2017
Milnor invariant is one of most important notions for classifying link groups in the low-dimensional topology. The invariant is, however, not easy to compute for large links. Thus, in this research, we propose a useful tool for this analysis using...
Study on Milnor invariants via finite type invariants
Project Year: Apr 2014 - Mar 2017
For an n-component link, the Milnor invariant is defined for any finite sequence of numbers in {1,2,...,n}. It is very important in Knot (Link) Theory to study relations between Milnor invariant and other invariants. In this research, we give rela...
Study on the classification of string links up to Cn-concordance
Project Year: Apr 2011 - Mar 2014
The set SL(m) of m-string links has a monoid structure, given by the stacking product. When considered up to concordance, SL(m) becomes a group, which is known to be abelian only if m=1. In this study, we consider a new equivalence relation which ...
OnMilnorinvariantsandclassificationoflinksunder freeselfCn-equivalence
Project Year: Apr 2010 - Mar 2013
We introduced simple ribbon moves, and as their extension, simpleribbon fusions toward a systematic construction of ribbon links inspired by Milnor links.Then we studied the effect if we apply them to links, especially on disconnectivity numbersof...
Cn-equivalence on string links and Milnor invariants
For any finite sequence I valued in {1, …, m}, Milnor invariant μ(I) for m-string links are defined. We denote by r(I) the maximal number of times which any index appears in I. We give a geometric characterization for string links which have same ...