Comparing genera, Bridge-1 genera and Heegaard genera of knots

发布时间:2025-10-10 供稿单位:数学与统计学院 点击次数:

标题:Comparing genera, Bridge-1 genera and Heegaard genera of knots

报告时间:20251013日(星期一)1330-1430

报告地点:线上腾讯会议(会议ID514775409,会议密码:1013

主讲人:邹燕清

主办单位:数学与统计学院

报告内容简介:

Let h(K), g_H(K), g_1(K), t(K) be the h-genus, Heegaard genus, bridge-1 genus, tunnel number of a knot K in the 3-sphere S^3, respectively. It is known that g_H(K)-1=t(K) g_1(K) h(K) g_H(K). A natural question arises: when do these invariants become equal?

We provide the necessary and sufficient conditions for equality and use these to show that for each integer n 1, the following three families of knots are infinite:

A_{n}={K| t(K)=n<g_1(K)}, B_{n}={K| g_1(K)=n<h(K)}, C_{n}={K| h(K)=n<g_H(K)}.

This is a joint work with Ruifeng Qiu and Chao Wang.

主讲人简介:

邹燕清,博士毕业于大连理工大学数学科学学院,现为华东师范大学研究员。主要研究方向为三维流形理论研究,已在J. Topol等期刊上发表论文20余篇,目前主持国家基金面上项目等项目。