# Applications of Knot Theory by Dorothy Buck and Erica Flapan, Dorothy Buck, Erica Flapan

By Dorothy Buck and Erica Flapan, Dorothy Buck, Erica Flapan

Over the last 20-30 years, knot idea has rekindled its historical ties with biology, chemistry, and physics as a way of constructing extra refined descriptions of the entanglements and homes of average phenomena--from strings to natural compounds to DNA. This quantity relies at the 2008 AMS brief path, purposes of Knot idea. the purpose of the fast path and this quantity, whereas no longer masking all facets of utilized knot thought, is to supply the reader with a mathematical appetizer, in an effort to stimulate the mathematical urge for food for additional examine of this interesting box. No earlier wisdom of topology, biology, chemistry, or physics is believed. particularly, the 1st 3 chapters of this quantity introduce the reader to knot thought (by Colin Adams), topological chirality and molecular symmetry (by Erica Flapan), and DNA topology (by Dorothy Buck). the second one half this quantity is targeted on 3 specific functions of knot idea. Louis Kauffman discusses purposes of knot thought to physics, Nadrian Seeman discusses how topology is utilized in DNA nanotechnology, and Jonathan Simon discusses the statistical and lively houses of knots and their relation to molecular biology

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2 Axiom of infinity and Desargues' axioms Fig. 11 Fig. 12 respect to B. In addition, any point is said to be a symmetric point of the point with respect to itself. By this definition, it is easy to prove that if e is the symmetric point of A with respect to B, then A is also the symmetric point of e with respect to B. One may also prove that if two lines I, I' meet at a point A, and two points B, B' distinct from A lie on I, I', respectively, while e, e' are the symmetric points of A with respect to B, B', respectively, then ee' is parallel to BB'.

The above proof is rather cumbersome and the interested reader may refer to Sect. 1. From this proof and the definition itself, it is easy to see the reflexivity, symmetry, and transitivity of the congruence relation. In other words, we have the following. Theorem. The congruence relation equivalence relation. "==" among pairs of points on a line is an Below we shall introduce the addition of pairs of points. For this purpose, we first prove the following. Lemma. Let the points A, B, C, D, E, F lie on one and the same line 1 with (AB) == (DE), (BC) == (EF).

Furthermore, we can introduce a greatness relation among the rational numbers in a Desarguesian number system, satisfying the usual properties. But, generally speaking, there is no greatness relation between two arbitrary numbers. 4 Number system 35 some supplementary axioms below. Whether or not a number system is assumed to satisfy these axioms will depend on the concrete situation. Commutative axiom of multiplication (N 13) N 13. For any two numbers a, bEN, ab = ba always holds. Axioms of order (N 14-N 17) N 14.