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Description
Introduction to Topology: Second EditionOne of the most important milestones in mathematics in the twentieth century was the development of topology as an independent field of study and the subsequent systematic application of topological ideas to other fields of mathematics. While there are many other works on introductory topology, this volume employs a methodology somewhat different from other texts. Metric space and point set topology material is treated in the first two chapters;
One of the most important milestones in mathematics in the twentieth century was the development of topology as an independent field of study and the subsequent systematic application of topological ideas to other fields of mathematics.While there are many other works on introductory topology, this volume employs a methodology somewhat different from other texts. Metric space and point-set topology material is treated in the first two chapters; algebraic topological material in the remaining two. The authors lead readers through a number of nontrivial applications of metric space topology to analysis, clearly establishing the relevance of topology to analysis. Second, the treatment of topics from elementary algebraic topology concentrates on results with concrete geometric meaning and presents relatively little algebraic formalism; at the same time, this treatment provides proof of some highly nontrivial results. By presenting homotopy theory without considering homology theory, important applications become immediately evident without the necessity of a large formal program.
Prerequisites are familiarity with real numbers and some basic set theory. Carefully chosen exercises are integrated into the text (the authors have provided solutions to selected exercises for the Dover edition), while a list of notations and bibliographical references appear at the end of the book.
Binding Type: Paperback
Publisher: Dover Publications
Published: 02/16/1999
ISBN: 9780486406800
Pages: 256
Weight: 0.69lbs
Size: 9.20h x 6.15w x 0.48d
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★★★★★ 5
Dog Loves this toy!
Color: Crab
Keeps our poodle entertained and excited. The rechargeable battery lasts a long time. You can make it play crazy music or just shake. It’s hilarious to watch him play with it. It’s very chew resistant, and believe me, he tries his best to destroy it.
If you have a high energy dog, they’re gonna love it.
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Reviewed in the United States on June 3, 2026
★★★★★ 5
Great toy for puppies!
Color: Turtle
I love this turtle. My toy poodle puppy has boundless energy. She loves this thing. It keeps her busy so I can get laundry and other things done. I am buying a second one for when the first one loses its charge😂
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Reviewed in the United States on May 30, 2026
★★★★★ 3
It broke within the week
Color: Turtle
The toy was ADORABLE, it worked very well for the first week. And then it broke. I bought two for my puppy and my 8 year old shih tzus. It stopped vibrating and just made loud grinding and squeaking noises. I would recommend this toy if it lasted longer.
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Reviewed in the United States on April 26, 2026
★★★★★ 4
Offers tons of activity
Color: Turtle
My 70lb dog LOVES this turtle toy, was worth the price. He will play and play until he’s exhausted. We have to give him breaks from it. We use the second setting which is just for movement, no music. The only aspect I don’t like is that he will inadvertently press the button when he’s biting the toy, changing the setting and sometimes has turned it off. The velcro is super strong, which is good but makes it difficult to open. Battery life is decent, lasted a few days with him playing with it an hour or so each evening. I like the auto shut off after 30 minutes of no movement.
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Reviewed in the United States on May 14, 2026
★★★★★ 5
Great toy for a dog who is not afraid of noises
Color: Crab
My puppy loves this thing! She was confused at first but now she plays with it daily. I just let it jump and sing the first time. She looked at it with the cutest head tilt. It is a bit loud so if you have a dog that's scared of noises this might be the right toy. Now when she picks it up, I turn it on and she gets so excited! The different songs make the toy less annoying for me, lol. Honestly, anything to tire out a 4 month old puppy. She is very entertaining to watch.
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Reviewed in the United States on May 7, 2026
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