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arXiv 0812.1396math.GT
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隧道水平、深度和桥梁编号

Tunnel leveling, depth, and bridge numbers

Sangbum Cho, Darryl McCullough

摘要:

这是三篇论文中的第三篇,它们完善和扩展了我们早期预印本的部分内容,“结隧道的深度”。“他们一起重新制作了整个预印本。本文利用我们在“结点隧道树”中引入的隧道数为1的结点理论,加强了H。Goda,M. Scharlemann和A.汤普森这就产生了关于隧道1号节的桥梁编号的大量信息。特别是,我们计算的最小桥数的一个结作为其隧道的最大深度不变量d的函数。该值的增长大约为(1+ \sqrt{2})^d。我们还发现,最大的桥梁数量作为一个功能的电缆建设需要产生的隧道,特别是显示,最大的桥梁数量的一个结产生的n电缆建设是(n+2)的第二斐波纳契数。最后,我们研究特殊情况下的“中间”隧道的环面结。

英文摘要:

This is the third of three papers that refine and extend portions of our earlier preprint, "The depth of a knot tunnel." Together, they rework the entire preprint. In this paper, we use the theory of tunnel number 1 knots that we introduced in "The tree of knot tunnels" to strengthen the Tunnel Leveling Theorem of H. Goda, M. Scharlemann, and A. Thompson. This yields considerable information about bridge numbers of tunnel number 1 knots. In particular, we calculate the minimum bridge number of a knot as a function of the maximum depth invariant d of its tunnels. The growth of this value is on the order of (1+\sqrt{2})^d. We also find the maximum bridge number as a function of the number of cabling constructions needed to produce the tunnel, showing in particular that the maximum bridge number of a knot produced by n cabling constructions is the (n+2)nd Fibonacci number. Finally, we examine the special case of the "middle" tunnels of torus knots.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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