Explorations in Topology: Map Coloring, Surfaces and Knots
By David Gay
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About this ebook
Explorations in Topology, Second Edition, provides students a rich experience with low-dimensional topology (map coloring, surfaces, and knots), enhances their geometrical and topological intuition, empowers them with new approaches to solving problems, and provides them with experiences that will help them make sense of future, more formal topology courses.
The book's innovative story-line style models the problem-solving process, presents the development of concepts in a natural way, and engages students in meaningful encounters with the material. The updated end-of-chapter investigations provide opportunities to work on many open-ended, non-routine problems and, through a modified "Moore method," to make conjectures from which theorems emerge. The revised end-of-chapter notes provide historical background to the chapter's ideas, introduce standard terminology, and make connections with mainstream mathematics. The final chapter of projects provides ideas for continued research.
Explorations in Topology, Second Edition, enhances upper division courses and is a valuable reference for all levels of students and researchers working in topology.
- Students begin to solve substantial problems from the start
- Ideas unfold through the context of a storyline, and students become actively involved
- The text models the problem-solving process, presents the development of concepts in a natural way, and helps the reader engage with the material
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Explorations in Topology - David Gay
1
Acme Does Maps and Considers Coloring Them
The reader is introduced to coloring maps on a sphere and on an island.
Coloring rules are presented and refined. Several examples of real
and imagined
maps are examined. For coloring purposes, it is shown that the exact shape of countries is not important. A map can be distorted, as if made of rubber, but the problem of its coloring remains the same. Problems are introduced: (1) Find the fewest number of colors needed to color a given map. (2) Answer the question: Can one find a number N so that all maps (on an island) can be colored in N or fewer colors? (3) Then, if such an N exists, find it! A partial solution to these problems is found: All of a certain simple class of maps can be colored in two colors. Enlarging this class is the topic of many end-of-chapter