Customer Reviews

Introduction to Topology: Third Edition (Dover Books on Mathematics)

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I was not a mathematics major, and only in recent years have I ventured into abstract mathematics. I was motivated to learn about topology as an aid to understanding a particular 3-D earth modeling application.

I read Introduction to Topology in three stages: as a review of set theory and metric spaces (chapters 1 and 2), then as an introduction to topology (chapter 3), and lastly as a detailed look at two important topological properties, connectedness (chapter 4) and compactness (chapter 5). I had previously read (and reviewed) another book titled Metric Spaces by Victor Bryant, but Mendelson is my first serious look at topology.

My reading of Mendelson - a 200-page text - required about 100 hours, substantially longer than the 40 to 60 hours estimated by an earlier reviewer. No solutions are provided for the section problems, which are generally proofs, not explicit problems.

The first chapter provides a concise overview of set theory and functions that is essential for Mendelson's later chapters on subsequent set-theoretic analysis of metric spaces and topology.

The second chapter is a solid introduction to metric spaces with good discussions on continuity, open balls and neighborhoods, limits from a metric space perspective, open sets and closed sets, subspaces, and equivalence of metric spaces. Chapter 2 concludes with a brief introduction to Hilbert space.

The third chapter introduces topological spaces as a generalization of metric spaces, and many theorems are largely restatements of the metric space theorems derived in chapter 2. I was thankful for this approach.

Mendelson begins chapter 3 by demonstrating that 1) open sets and neighborhoods are preserved in passing from a metric space to its associated topological space and 2) the existence of a one to one correspondence between the collection of all topological spaces and the collection of all neighborhood spaces.

He then reminds us that in a metric space we can say that there are points of a subset A arbitrarily close to a point x if the metric d(x, A) = 0. In characterizing this notion of arbitrary closeness in a topological space, Mendelson introduces the closure of A, the interior of A, and the boundary of A. Other topics included topological functions, continuity, homeomorphism (the equivalence relation), subspaces, and relative topology. The final sections in chapter 3 on products of topological spaces, identification topologies, and categories and functors were more difficult.

In chapter 4 the initial sections (connectedness on the real line, the intermediate value theorem, and fixed point theorems) were largely familiar. But thereafter I became bogged down with the discussions of path-connected topological spaces, especially with the longer proofs involving the concepts of homotopic paths, the fundamental group, and simple connectedness.

Chapter 5, titled Compactness, was even more abstract and difficult, with topics like coverings, finite coverings, subcoverings, compactness, compactness on the real line, products of compact spaces, compact metric spaces, the Lebesgue number, the Bolzano-Weierstrass property, and countability. Perhaps, a reader more familiar with analysis would have less difficulty with the last two chapters.

In summary, Introduction to Topology is quite useful for self-study. Mendelson's short text was intended for a one-semester undergraduate course, and it is thereby ideal for readers that either require a basic introduction to topology, or need a quick review of material previously studied. The last two chapters on connectedness and compactness are substantially more difficult, but are still accessible to the persistent reader.

This book is ideal for self-study. If you have not had the luxury of taking a topology course during your undergraduate studies, but you need to know some topology and you have to study it by yourself, this is the book you need. It is very readable and it explains carefully every concept. However, it is just an introductory text and it contains only basic material. You don't have to invest a lot of time to study the material in this book: let's say 40-60 hours of study are enough to grasp everything. I reccomend it especially to those graduate students of applied mathematics, finance, statistics or economics, who need to use some basic result from topology in their work.

I bought this book for my own enlightenment after already having a course in Topology here at Penn State University. What I find most interesting about this book is that the author explains the philosophy on the ideas and what we are really trying to say with these definitions and theorems. The book I used in my course didn't explain much at all so it would have been much more difficult to teach yourself from this book. Topology is somewhat abstract so if you're looking to study Topology this is a great book to start. A word of advice, read over a theorem and proof and try to reproduce it on paper from your mind. Help yourself from the book a bit along the way if necessary. You will learn much more this way as opposed to following along the proofs in the book as you read. You might also be interested in Counterexamples in Topology, a book with thousands of counterexamples.

I highly recommend this book. The problems are excellent. They really hit home and force you to truly understand the content. They get to the crux of the issues (some problems specifically test to make sure you didn't misinterpret a definition for example) and they're also interesting.

The book is carefully written in a simple style. It's a bit hard to explain... For lack of a better explanation, an analogy would be to how Mac computers are simple to use but not lacking in function. One specific example that I can pinpoint is that the author avoids using symbols excessively.

It is not a "layman" book at all however. Some problems take a lot of thinking. Some of them take me a few hours of scribbling in my notebooks and some of them take a few days of mulling over on top of that. But I'm not a math student or math practitioner (only a hobby at this point) so mathematicians-to-be should have an easier time than I.

Absolutely great reading. It starts by explaining set theory more thorougly than many other introductory books, while it does it in a rigorous manner that prepares you for the rest of the chapters. I'm just a mathematics hobbyist, and I still have no problem grasping the content, while you can really appreciate the mathematical rigour. Great read. Go for it.

Crystal clear in its structure, this book is my first introduction to topology, and I won't be needing another. If you like texts which are rather on the terse side, and don't mind doing exercises, then this is the book for you.

The only thing that bothered me at first was the lack of exercise solutions. But in retrospect, the time I spent thinking about hard exercises (which I would have looked up out of lazyness) turned out to be the most fruitful time of the entire reading experience.

This is a terrific introduction to topology. The problems are especially well chosen -- working through the problems will maximize your understanding. Competance in undergrad calculus is probably all that you'll need. Well written -- I can't imagine another book on the subject that would be more approachable.

Intended for the advanced undergraduate student with a respectable level of mathematical maturity, Mendelson begins with the necessary review of set theory. From there the book delves into metric spaces, topological spaces, connectedness, and compactness. In short, it presents the basics of topology in a clear, linear, very readable fashion.

Readers would be well advised to be familiar with the elements of proof, set theory, linear algebra, and abstract algebra in addition to analysis. A knowledge of geometry is also helpful, as one might expect.

Weighing the price of this book against the depth and breadth of other texts, this volume offers more to the student who is studying topology on a budget. Unfortunately, as with most books in this category, there is no solution guide provided for the exercises. A selection of hints for the exercises would have been a nice addition but otherwise does not detract from the purpose of the work: to give the beginning topologist an overview of the subject.

While this book is good, its a little overhyped. I did not particularly care for this book's presentation of connectedness and compactness (ie, the last two chapters), but the first three chapters were good. The problems in this book were also pretty good. They were at least interesting and difficult. However, there are no solutions, so it might not be the best book for self study. I personally think introduction to topology by gamelin and greene is better. These books should be used in conjunction with topology by munkres.

This is a Wonderful book. I have my B.S. in Mathematics and I am in Graduate School for Mathematics. I am signed up for a Topology class next semester and to be ready, I picked up this, Introduction to General Topology by Cain and Topology by Munkres. Out of all of them this one presents Topology in the nicer way. Unlike in Munkres, it reads like a book, and unlike in Cain it doesn't assume steps and connections. This book provided the nice grounding for a more intuitive take on Topology by starting with Metric spaces and then linking everything from there. Cain then allowed for me to practice by giving me some examples and simple exercises. If there is one thing I would suggest to the author, put in some examples and some less general exercises.
Loved it and would suggest this book to anyone.