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

By Inga Johnson, Allison K. Henrich

This well-written and interesting quantity, meant for undergraduates, introduces knot thought, a space of transforming into curiosity in modern arithmetic. The hands-on strategy gains many workouts to be accomplished by means of readers. necessities are just a uncomplicated familiarity with linear algebra and a willingness to discover the topic in a hands-on manner.
The establishing bankruptcy bargains 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 consultant the reader to find the formal definition of a knot, households of knots and hyperlinks, and numerous knot notations. Additional themes contain combinatorial knot invariants, knot polynomials, unknotting operations, and digital knots.

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Additional resources for An Interactive Introduction to Knot Theory

Sample text

Record your findings and conjectures. 1. Build them with pipe cleaners, and determine any equivalences between different pictures. Record your findings and conjectures. Given a link L in space and a light source some distance away, the shadow of the link made on a plane across from the light source is called a projection or shadow of the link. 1, but they are missing information about which is the under-strand and which is the over-strand. The curve intersections in a projection are called precrossings.

The inverse of a move of type (i)-(iii) is also a planar isotopy. A sequence of several planar isotopies is also considered to be a planar isotopy. , within a small region of the diagram and the diagram is unchanged outside this region. 2: Planar isotopies of types (i), (ii), and (iii). 2. 1 (b) to indicate an order in which they can be applied. ) For your ordering, determine the number of subtriangles that are planar isotopies of type (i), determine how many are of type (ii), and find how many are of type (iii).

Prove the following propositions. If Kenya (the knotter) plays second on a twist knot Tn, where n is even, then Kenya has a winning strategy. If Ulysses (the unknotter) plays second on a twist knot Tn, where n is even, then Ulysses has a winning strategy. 5. Investigate the Knotting-Unknotting game on the projection of twist knots Tn where n is odd. Who has a winning strategy when Kenya (the knotter) plays second? What about when Ulysses (the unknotter) plays second? Formulate and prove two propositions about these cases.

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