THE WARPING DEGREE OF A KNOT DIAGRAM

THE WARPING DEGREE OF A KNOT DIAGRAM
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DOI:
10.1142/s0218216510008194
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发表时间:
2008-09
影响因子:
0.5
通讯作者:
Ayaka Shimizu
Ayaka Shimizu
中科院分区:
数学4区
文献类型:
--
作者:
Ayaka Shimizu

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对于一个有向纽结图D,翘曲度d(D)是以通常的方式从D得到单调图所需的最小交叉变换次数。证明了d(D)+ d(-D)+ 1小于等于D的交叉数.此外,等式成立当且仅当D是交错图。对于一个纽结K,我们还估计了K的所有图D的d(D)+ d(-D)的最小值,其中c(D)= c(K)。
For an oriented knot diagram D, the warping degree d(D) is the smallest number of crossing changes which are needed to obtain the monotone diagram from D in the usual way. We show that d(D) + d(-D) + 1 is less than or equal to the crossing number of D. Moreover, the equality holds if and only if D is an alternating diagram. For a knot K, we also estimate the minimum of d(D) + d(-D) for all diagrams D of K with c(D) = c(K).