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On the AJ conjecture for cables of twist knots

Anh T. Tran (2015)

Fundamenta Mathematicae

We study the AJ conjecture that relates the A-polynomial and the colored Jones polynomial of a knot in S³. We confirm the AJ conjecture for (r,2)-cables of the m-twist knot, for all odd integers r satisfying ⎧ (r+8)(r−8m) > 0 if m > 0, ⎨ ⎩ r(r+8m−4) > 0 if m < 0.

On the boundary of 2-dimensional ideal polyhedra

Emmanuel Vrontakis (2006)

Commentationes Mathematicae Universitatis Carolinae

It is proved that for every two points in the visual boundary of the universal covering of a 2 -dimensional ideal polyhedron, there is an infinity of paths joining them.

On the Cantor-Bendixson rank of metabelian groups

Yves Cornulier (2011)

Annales de l’institut Fourier

We study the Cantor-Bendixson rank of metabelian and virtually metabelian groups in the space of marked groups, and in particular, we exhibit a sequence ( G n ) of 2-generated, finitely presented, virtually metabelian groups of Cantor-Bendixson rank  ω n .

On the colored Jones polynomials of ribbon links, boundary links and Brunnian links

Sakie Suzuki (2014)

Banach Center Publications

Habiro gave principal ideals of [ q , q - 1 ] in which certain linear combinations of the colored Jones polynomials of algebraically-split links take values. The author proved that the same linear combinations for ribbon links, boundary links and Brunnian links are contained in smaller ideals of [ q , q - 1 ] generated by several elements. In this paper, we prove that these ideals also are principal, each generated by a product of cyclotomic polynomials.

On the complexity of braids

Ivan Dynnikov, Bert Wiest (2007)

Journal of the European Mathematical Society

We define a measure of “complexity” of a braid which is natural with respect to both an algebraic and a geometric point of view. Algebraically, we modify the standard notion of the length of a braid by introducing generators i j , which are Garside-like half-twists involving strings i through j , and by counting powered generators Δ i j k as log ( | k | + 1 ) instead of simply | k | . The geometrical complexity is some natural measure of the amount of distortion of the n times punctured disk caused by a homeomorphism. Our main...

On the connectivity of skeletons of pseudomanifolds with boundary

R. Ayala, M. J. Chávez, Alberto Márquez, Antonio Quintero (2002)

Mathematica Bohemica

In this note we show that 1 -skeletons and 2 -skeletons of n -pseudomanifolds with full boundary are ( n + 1 ) -connected graphs and n -connected 2 -complexes, respectively. This generalizes previous results due to Barnette and Woon.

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