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Description
Introduction to Topology: Third EditionHighly regarded for its exceptional clarity, imaginative and instructive exercises, and fine writing style, this concise book offers an ideal introduction to the fundamentals of topology. Originally conceived as a text for a one semester course, it is directed to undergraduate students whose studies of calculus sequence have included definitions and proofs of theorems. The book's principal aim is to provide a simple, thorough survey of elementary
Highly regarded for its exceptional clarity, imaginative and instructive exercises, and fine writing style, this concise book offers an ideal introduction to the fundamentals of topology. Originally conceived as a text for a one-semester course, it is directed to undergraduate students whose studies of calculus sequence have included definitions and proofs of theorems. The book's principal aim is to provide a simple, thorough survey of elementary topics in the study of collections of objects, or sets, that possess a mathematical structure.The author begins with an informal discussion of set theory in Chapter 1, reserving coverage of countability for Chapter 5, where it appears in the context of compactness. In the second chapter Professor Mendelson discusses metric spaces, paying particular attention to various distance functions which may be defined on Euclidean n-space and which lead to the ordinary topology. Chapter 3 takes up the concept of topological space, presenting it as a generalization of the concept of a metric space. Chapters 4 and 5 are devoted to a discussion of the two most important topological properties: connectedness and compactness. Throughout the text, Dr. Mendelson, a former Professor of Mathematics at Smith College, has included many challenging and stimulating exercises to help students develop a solid grasp of the material presented.Binding Type: Paperback
Publisher: Dover Publications
Published: 07/01/1990
ISBN: 9780486663524
Pages: 224
Weight: 0.51lbs
Size: 8.41h x 5.44w x 0.45d
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4.6 ★★★★★
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Product Reviews
★★★★★ 1
it is not a toy a dog can chew on it lasted maybe 2 minutes
Size: Medium
it is not a toy a dog can chew on it lasted maybe 2 minutes
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 6, 2024
★★★★★ 1
Chew
Size: Medium, Size: Medium
Destroyed in less then 5 minutes ;(
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Reviewed in the United States on December 26, 2024
★★★★★ 5
The bone lasted a long time.
My border collie is a chewer. I can look at a toy and tell you how long it’s going to last. This bone has lasted months and she still will grab it and chew on it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 20, 2026
★★★★★ 5
⭐️⭐️⭐️⭐️⭐️ 5/5 – Finally, a Dog Toy That Actually Lasts!
We picked up this natural leather bone dog toy hoping it would survive longer than the usual toys our dog destroys in a day—and wow, it exceeded every expectation. The leather is thick, durable, and clearly great quality. Our dog has tried his best to tear it apart (like he does with every toy), but this one has held strong.
It’s been weeks now, and the toy still looks almost new. No frayed seams, no stuffing everywhere, no pieces breaking off. Just a solid, long-lasting toy that keeps our dog entertained without us having to constantly replace it.
If you’re tired of wasting money on toys that only last a few hours, this natural leather bone is absolutely worth it. Tough, safe, and built to last—our dog loves it, and so do we!
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Reviewed in the United States on November 18, 2025
★★★★★ 4
Great chew toys
Dogs love! Not rough on teeth. They do tend to pull long strings of thread off the leather and felt, which must be intercepted and cut off lest we have a string linear foreign body. I wish the whole held together a bit better. Fierce corgis can go through these pretty quickly.
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Reviewed in the United States on February 5, 2026
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