A note on regular isotopy of singular links

Tsau, Chichen

doi:10.1090/S0002-9939-01-06046-4

A note on regular isotopy of singular links
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by Chichen M. Tsau PDF

Proc. Amer. Math. Soc. 129 (2001), 2497-2502 Request permission

Abstract:

We show that two isotopic oriented 4-valent singular link diagrams with transverse intersections are regularly isotopic if and only if they have the same writhe and the same rotation number.

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