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Dive into the research topics where Fumikazu Nagasato is active.

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Featured researches published by Fumikazu Nagasato.


Journal of Knot Theory and Its Ramifications | 2006

SOME RESULTS ABOUT THE KAUFFMAN BRACKET SKEIN MODULE OF THE TWIST KNOT EXTERIOR

Răzvan Gelca; Fumikazu Nagasato

In this paper, we list in explicit form the factoring relations of the Kauffman bracket skein module (KBSM for short) of a twist knot exterior. This is done using curves decorated by characters of irreducible SL(2, ℂ)-representations. In the process, we exhibit a relation which holds in the KBSM of the knot exterior, called the minimal relation. In the final section we prove that, when specializing the variable of the Kauffman bracket at t = -1, the minimal relation becomes the defining polynomial of the SL(2, ℂ)-character variety of the twist knot.


Journal of Knot Theory and Its Ramifications | 2005

COMPUTING THE A-POLYNOMIAL USING NONCOMMUTATIVE METHODS

Fumikazu Nagasato

In this paper we give a formula for the A-polynomial of the (2, 2p + 1)-torus knot, for any integer p, by using noncommutative methods (the Kauffman bracket skein modules).


International Journal of Mathematics | 2017

On minimality of two-bridge knots

Fumikazu Nagasato; Masaaki Suzuki; Anh T. Tran

A knot is called minimal if its knot group admits epimorphisms onto the knot groups of only the trivial knot and itself. In this paper, we determine which two-bridge knot


Mathematische Annalen | 2012

On the geometry of the slice of trace-free \({{SL_2(\mathbb{C})}}\)-characters of a knot group

Fumikazu Nagasato; Yoshikazu Yamaguchi

\mathfrak{b}(p,q)


arXiv: Geometric Topology | 2008

On the geometry of a certain slice of the character variety of a knot group

Fumikazu Nagasato; Yoshikazu Yamaguchi

is minimal where


Topology and its Applications | 2012

On minimal elements for a partial order of prime knots

Fumikazu Nagasato

q \leq 6


arXiv: Geometric Topology | 2013

Presentations of character varieties of 2-bridge knots using Chebyshev polynomials

Fumikazu Nagasato; Anh T. Tran

or


Osaka Journal of Mathematics | 2016

Some families of minimal elements for a partial ordering on prime knots

Fumikazu Nagasato; Anh T. Tran

p \leq 100


arXiv: Geometric Topology | 2017

Trace-free characters and abelian knot contact homology II

Fumikazu Nagasato; Shinnosuke Suzuki

.


Archive | 2017

Ghost characters and character varieties of 2-fold branched covers

Fumikazu Nagasato; Shinnosuke Suzuki

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Anh T. Tran

University of Texas at Dallas

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Răzvan Gelca

Tokyo Institute of Technology

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