By N. D. Gilbert, T. Porter

This hugely readable textual content info the interplay among the mathematical conception of knots and the theories of surfaces and staff displays. It expertly introduces a number of themes serious to the advance of natural arithmetic whereas delivering an account of math "in action" in an strange context. starting with an easy diagrammatic method of the learn of knots that displays the inventive and geometric charm of interlaced kinds, Knots and Surfaces takes the reader via fresh examine advances. subject matters comprise topological areas, surfaces, the elemental crew, graphs, loose teams, and crew displays. The authors skillfully mix those themes to shape a coherent and hugely constructed conception to discover and clarify the available and intuitive difficulties of knots and surfaces to scholars and researchers in arithmetic.

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**Additional resources for Knots and Surfaces**

**Example text**

The study of surfaces, however, has no need of knot theory for motivation. There are important applications of the classification theorem for surfaces in other areas of mathematics, perhaps most notably in complex analysis, but we will not be going in that direction here. Sphere Fig. 1 Torus Fig.

The flow of ideas is two way and we shall see later on how surfaces help us to study knots. The study of surfaces, however, has no need of knot theory for motivation. There are important applications of the classification theorem for surfaces in other areas of mathematics, perhaps most notably in complex analysis, but we will not be going in that direction here. Sphere Fig. 1 Torus Fig.

Perhaps we should reformulate the problem. It is better to have as rich a structure of open sets as we can on Y subject to the condition that f be continuous, and this idea motivates the following definition. Given a topological space X, a set Y, and a function f: X ~ Y, the identification topology on Yis obtained by defining U ~ Yto be open if and only ifits inverse imagef-I(U) is open in X. It is immediately obvious that this definition makes f continuous. Topological spaces An important application of the identification topology is to the quotient set of an equivalence relation.