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2017 | OriginalPaper | Buchkapitel

3. Link, Writhe, and Twist

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Abstract

We review the concepts of writhe, twist, and linking as applied to space curves and ribbons. The application of these concepts to DNA is also discussed.

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Fußnoten
1
We refer the reader to Bergou et al. [22] and Hanson [155, Chapter 20] for details on the numerical computation of the Bishop frame for space curves.
 
2
The total surface area of a unit sphere is 4π. In topology, the area A in Figure 3.2 is known as a solid angle.
 
3
Our historical comments in this section are based entirely on the (recent) insightful papers by Epple [95, 96] and Ricca and Nipoti [301]. The latter paper contains a translation of the page in Gauss’ notebook where Eqn. (3.28) is presented as well as copies of letters from Maxwell to Tait discussing the linking number.
 
4
Our convention for writing \(L_{\mbox{ k}}\left (\mathcal{S}_{1},\mathcal{S}_{2}\right )\) is taken from Spivak [329, Problem 8.28, Page 402] and differs from Gauss’ original prescription by a minus sign. As a result, our computations using Eqn. (3.28), such as the results shown in Figure 3.9, agree with those found by counting the signed crossings using Eqn. (3.34).
 
5
These methods are discussed in several places in the literature and summarized in Rolfsen’s text [303, Chapter 5, Section D].
 
6
Fuller’s version of Eqn. (3.38) differs from ours in that \(T_{\text{w}}\left (\mathcal{S},\mathbf{e}_{n}\right )\) is replaced by the more general case \(T_{\text{w}}\left (\mathcal{S},\mathbf{u}\right )\) in Eqn. (3.38). Alternative proofs of Fuller [111, Eqn. (6.​3)] can be found in Aldinger et al. [7] and Kamien [176].
 
7
The parameters for this curve are discussed in Section 1.​3.​4.
 
8
The orientability condition on the ribbon is satisfied when u(s) = u(s + ) where s ∈ [0, ] on \(\mathcal{S}\). Thus, the ribbon is not a Möbius strip.
 
9
As emphasized in [7], the domain of integration excludes those points s 1 = s 2 where the integrand becomes unbounded.
 
10
The primary reference for our summary of the methods used to compute the writhing number is [7]. We also recommend the later works [20, 21, 85, 169, 176] for helpful perspectives and insights on this topic.
 
11
The curves considered in [360] are discussed in Exercise 3.9.
 
12
See [169, 360] and references therein.
 
13
We refer the reader to [239] for a discussion of Călugăreanu’s legacy and the roles played by Călugăreanu’s theorem and Eqn. (3.60).
 
14
For examples, see [18, 360, 361].
 
15
Underwound is also termed negatively supercoiled in contrast to the case σ > 0 which is termed positively supercoiled.
 
16
This result was first established by Maxwell [95, 301].
 
17
The curve \(\mathcal{S}_{2}\) is not identical to the curve \(\mathcal{S}_{2}\) that is defined in Eqn. (3.52)2.
 
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Metadaten
Titel
Link, Writhe, and Twist
verfasst von
Oliver M. O’Reilly
Copyright-Jahr
2017
DOI
https://doi.org/10.1007/978-3-319-50598-5_3

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