collaborators

4 papers

math.GT2026

Montesinos Knots with Delta-Unknotting Number One

Kazumichi Nakamura

The -unknotting number for a knot is defined as the minimum number of -moves needed to deform the knot into the trivial knot. In this paper, we discuss Montesinos knots whose…

math.GT2026

Delta-Unknotting Number for Montesinos Knots

Kazumichi Nakamura

The -unknotting number for a knot is defined as the minimum number of -moves needed to deform the knot into the trivial knot. In this paper, we determine the -unknotting n…

math.GT2026

Delta-Unknotting Number for Pretzel Knots

Kazumichi Nakamura

The -unknotting number for a knot is defined as the minimum number of -moves needed to deform the knot into the trivial knot. It is known that, for positive pretzel knots, th…

math.GT2025

Delta-Unknotting Number for Two-Bridge Knots

Kazumichi Nakamura

The -unknotting number for a knot is defined as the minimum number of -moves needed to deform the knot into the trivial knot. We determine the -unknotting numbers for two-…