Crosscap numbers of alternating knots via unknotting splices
2020 ◽
Vol 31
(07)
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pp. 2050057
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Ito–Takimura recently defined a splice-unknotting number [Formula: see text] for knot diagrams. They proved that this number provides an upper bound for the crosscap number of any prime knot, asking whether equality holds in the alternating case. We answer their question in the affirmative. (Ito has independently proven the same result.) As an application, we compute the crosscap numbers of all prime alternating knots through at least 13 crossings, using Gauss codes.
2019 ◽
Vol 28
(05)
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pp. 1950033
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2015 ◽
Vol 25
(04)
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pp. 299-308
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2018 ◽
Vol 27
(08)
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pp. 1850046
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2017 ◽
Vol 26
(13)
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pp. 1750090
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2017 ◽
Vol 13
(03)
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pp. 751-759
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2019 ◽
Vol 11
(02)
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pp. 1950028
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2017 ◽
Vol 26
(14)
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pp. 1750100
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