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
中科院分区:
文献类型:
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作者:
Ayaka Shimizu
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).