Download An Interactive Introduction to Knot Theory by Inga Johnson, Allison K. Henrich PDF

By Inga Johnson, Allison K. Henrich

This well-written and fascinating quantity, meant for undergraduates, introduces knot concept, a space of growing to be curiosity in modern arithmetic. The hands-on strategy beneficial properties many workouts to be accomplished by means of readers. necessities are just a simple familiarity with linear algebra and a willingness to discover the topic in a hands-on manner.
The beginning bankruptcy deals actions that discover the realm of knots and hyperlinks — together with video games with knots — and invitations the reader to generate their very own questions in knot concept. next chapters advisor the reader to find the formal definition of a knot, households of knots and hyperlinks, and diverse knot notations. Additional issues comprise combinatorial knot invariants, knot polynomials, unknotting operations, and digital knots.

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Extra info for An Interactive Introduction to Knot Theory

Example text

4: This elementary move, called an R1 move, changes the number of crossings in the diagram by one. 4. 4). Then the elementary move ΔABC is called an R1 move. 5. 1. Before adding more moves to our list, let’s eliminate from consideration a special type of elementary triangle that an R1 move is designed to address. The next two lemmas will help when proving that our list is “long enough” because they allow us to focus our proof on certain “nice” elementary triangles. From the definition of a link, there are two line segments that emanate from a segment AB, and there are two possibilities of how an elementary triangle might interact with the two line segments of the diagram that emanate from AB.

How can we determine the unknotting number of a knot? How can one produce a table of the simplest knots? How should the complexity of a knot be measured? Which knots are amphichiral? Given a knot K, how can we determine if K is prime? Is there a definition of an alternating knot that relies only on a knot’s position in space and not on any diagrams of the knot? Which knots are invertible? 1. Add your own questions to the list above. Chapter 2 Definition and Equivalence of Knots and Links So far, we’ve been exploring knot theory using intuitive ideas about what knots and links are and when they are equivalent.

Record your findings and conjectures. A link can be given an orientation by simply assigning a direction of travel around each loop. 2. 1: A knot and its mirror image. 2: Example of an oriented knot. For an oriented knot diagram D, the same diagram with the opposite orientation is called the reverse of D, denoted . For some links, the choice of orientation does not matter. That is, the oriented link is equivalent to its reverse. A link with this property is called invertible. 3. 1 are invertible.

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