By H. Graham Flegg

Publish yr note: initially released in 1974

This first-class creation to topology eases first-year math scholars and basic readers into the topic by means of surveying its suggestions in a descriptive and intuitive means, trying to construct a bridge from the popular ideas of geometry to the formalized research of topology. the 1st 3 chapters specialize in congruence sessions outlined by way of changes in actual Euclidean house. because the variety of authorized adjustments raises, those sessions develop into better, and their universal topological houses turn into intuitively transparent.

Chapters 4–12 supply a mostly intuitive presentation of chosen issues. within the ultimate 5 chapters, the writer strikes to a extra traditional presentation of continuity, units, services, metric areas, and topological areas.

Exercises and difficulties. a hundred and one black-and-white illustrations.

From 1974 edition

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Additional info for From Geometry to Topology (Dover Books on Mathematics)

Sample text

For example, R90 and R270 are inverses of each other, and H is its own inverse. The term inverse is a descriptive one, for if A and B are inverses of each other, then B “undoes” whatever A “does,” in the sense that A and B taken together in either order produce R0, representing no change. Another striking feature 32 Groups of the table is that every element of D4 appears exactly once in each row and column. This feature is something that all groups must have, and, indeed, it is quite useful to keep this fact in mind when constructing the table in the first place.

Otherwise, we say the group is non-Abelian. Thus far, we have illustrated, by way of D4, three of the four conditions that define a group—namely, closure, existence of an identity, and existence of inverses. The remaining condition required for a group is associativity; that is, (ab)c 5 a(bc) for all a, b, c in the set. To be sure that D4 is indeed a group, we should check this equation for each of the 83 5 512 possible choices of a, b, and c in D4. In practice, however, this is rarely done! Here, for example, we simply observe that the eight motions are functions and the operation is function composition.

38 Groups 23. What would the effect be if a six-bladed ceiling fan were designed so that the centerlines of two of the blades were at a 708 angle and all the other blades were set at a 588 angle? Reference 1. B. B. Capitman, American Trademark Designs, New York: Dover, 1976. Suggested Reading Michael Field and Martin Golubitsky, Symmetry in Chaos, Oxford University Press, 1992. This book has many beautiful symmetric designs that arise in chaotic dynamic systems. Niels Abel He [Abel] has left mathematicians something to keep them busy for five hundred years.

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