Customer Reviews

Introduction to Linear Algebra, Third Edition

5 star:		(8)
4 star:		(2)
3 star:		(0)
2 star:		(1)
1 star:		(0)

 

 

As someone who already knows the basics of the subject, I guess I'm looking at things with the benefit of hindsight. However, I needed to shore up my own knowledge of Linear Algebra and thought I might as well turn to Strang for a refresher and a different approach.

The result is that I am truly pleased with this book. His writing is lively and engaging. Linear Algebra has a phenomenal tendency to get dry and Strang does an excellent job of turning the subject this way and that so that one can admire it from every angle. In particular, there are three major approaches in this book that make it stand out.

1. Strang places heavy emphasis on vectors, vector spaces and transformations. This is good preparation for future study in Linear Algebra. This will provide an intuitive understanding of linear operators on vector spaces later.

2. Another reviewer mentioned that the book utilises a discovery-based approach. While this might be a disadvantage when you're in a hurry, the approach prepares one well for learning more theoretically oriented subjects where self-guided discovery is imperative. In this sense, I think the discovery approach is far superior to others and prepares the reader well for future studies. The problems are really fun (although I personally think they are much too easy). Many of the questions require light-weight proofs without undue formalism (not really required at this level). These pseudo-proofs really do help build understanding of the subject. Maths-phobes will not even realise that they're fleshing out the subject themselves.

3. The didactic approach taken in the book is conversational and informal. When added to the freely available video lectures at the OCW site, given by Strang himself, you really have a perfect introduction to the subject of Linear Algebra. The lectures are superb and Strang is an excellent teacher. His enthusiasm and passion for the subject is obvious and infectious.

I really wish I had learned Linear Algebra from this book initially. The book does a good job of encouraging geometric intuition and visualisation. That said, I do not think the book is an ideal book for maths majors. The primary problems being too little exposure to abstraction and problems which are too easy. However, I do believe that the book can be used in conjunction with a more rigorous approach in cases where the latter gets just a touch too dry. There is time to develop the rigour in theoretical Algebra courses at a later stage, with the added benefit that the reader will have learned the experimental approach to learning taken in the book.

I suppose some will find Strang's excitement over Linear Algebra a bit of a pain, but personally I think this conveys the sheer joy of pursuing an intellectual endeavour. I've always bordered on disinterest with Linear Algebra and this has been very much dispelled. I like to be reminded why I chose to study mathematics in the first place sometimes. While I can see that this book isn't for everyone, I really enjoy it and recommend it highly.

People say that mathematical truths never change, and that's true enough. New concepts, applications, and techniques keep emerging, though, so math teaching needs to keep up with the times. Strang has done an outstanding job of keeping this book current and relevant.

It's not a mathematician's math book - this is aimed at people who need results and needs computational techniques more than they need crystalline theorems. That's why it's so helpful to see applications like Markov models, Kirchoff's laws, and Google's analyses of the web. It's also helpful to see examples worked in Mathematica and MATLAB, the tools of choice for desktop exploration of numerical systems. It's startlingly easy to come up with a 100x100 system of equations, and just nuts to try to solve it by hand.

Strang assumes some amount of calculus in this book, something that other books on linear algebra sometimes skip. That raises the bar for the readership, but also opens up topics like change-of-basis in function space, including Fourier analysis. It also allows differential equations to be addressed as linear systems. Even without calculus, though, a reader is exposed to the singular value decompostion, QR and other matrix decompositions, and considerations in performing the computations. I found a few oddities, such as the description of a matrix's condition number. That has great physical meaning when it's taken as the ratio of the matrix's highest and lowest eigenvalues, but Strang gives a definition that I found less intuitive.

Such oddities are rare, though. Even though this book covers many topics, its emphasis is on clear and applicable presentation. I recommend this to anyone studying linear algebra or who, like me, has to brush up on basics not used in many years.

//wiredweird

I used the book for self-study in combination with Strang's freely available video lectures. The book's emphasis is on understanding and appreciating concepts, rather than on formal proofs. As I have experienced him, Strang is very good at explaining things. He uses lots of examples, and, the textbook as well as the video lectures are very easy to comprehend. His informal writing helps to make the book an interesting read. For me, having had some linear algebra in high school, most ideas were familiar. However, it was always delightful for me to look at Strang's perspective on things. One clearly sees that Strang has a lot of experience in teaching linear algebra. He introduces new ideas in a very natural way, emphasizing what they are good for beforehand. I particularly liked the chapter on determinants.

The book doesn't require any prior knowledge besides very basic high school math. I used it in my year of civilian national service, before starting to go to college. Compared to other college level books for math majors I have looked at, this book works great for self-study. The level of difficulty seems to be something inbetween high school and university level (math major).

I guess that's my best advice for anyone considering purchasing this book -- see if you can find a local copy first to examine. Pretty much everything you'd find in anyone else's linear algebra intro book is in his, so it's mainly a question of whether or not you like Strang's presentation of the material. Yes, he's kinda wordy, yes he probably gets a little overexcited at times and has too many exclamation points. However, you're going to spend a *lot* more time doing the problems than reading the text, so such reasons for disliking the book ring pretty hollow to me.

Other comments:

-- I *like* the fact that the book "reads like a novel;" it goes a long way towards providing motivation and insight relating to linear algebra, which a more "formal" (read: stuffy) book doesn't. It's clear to me that first and foremost Strang is trying to *teach*, whereas other books sometimes really make me wonder whether or not the author isn't just trying to demonstrate how clever they are.
-- I would agree with the "basically a good math book" reviewer who said it's not that great as a reference book and is light on advanced material. True enough, although given that it's "Introduction to Linear Algebra," I can't fault it for this.
-- On the other hand, Strang is teaching at a somewhat more abstract and advanced level than many intro linear algebra courses do (remember, this is used at MIT, and in many or perhpas even most cases the courses there simply are more challenging than the same course at other colleges). If you can wrap your mind around the abstraction and really understand what Strang's trying to commuincate, you'll end up with a better grasp of linear algebra than what most people have.

If you're in a working world situation and just "need some answers" without being force to learn where they come from (which Strang does tend to make you do), there are various "engineering mathematics" books that are probably a better buy if you're just after one book (I like Peter O'Neil's). I'd also suggest picking up a copy of a book like that if you're using Strang's book for self-study -- getting a couple of viewpoings on the same subject matter is enormously helpful when the first just isn't "clicking" for you.

Strang will occasionally state something like, "blah blah blah may seem difficult to understand now, but eventually it'll become quite obvious" -- and he's correct, at least if you go through his book and understand it. A good example of this is with least squares fitting -- the formulas for performing it really are "obvious" if you've been playing Strang's game all along; you really can just "write it down." I've yet to find that true with other books!

P.S. -- I definitely think that linear algebra wouldn't be a good career choice for the reviewer "bitlooter"!

Gilbert Strang is a very experienced teacher of Linear Algebra, and this book is written as a text based on his MIT linear algebra class. Math majors will not find the 'definition-proposition-lemma-theorem-proof-corollary' treatment here. Instead Strang, aware of the need to teach non-math majors the subject, explains linear algebra in a simple but effective way --examples, diagrams, motivations. This book is one of those with which you can skip class the whole semester and get good grades (but don't do it! get your education in the classroom).

It's hard to rate the textbook by itself, because I'm also watching the videos of the author's class on the MIT Open Courseware website. But no doubt, the two of these together are an unbeatable combination. The website videos are excellent. I do find the book somewhat hard to follow when I try to read it before watching the videos, but afterward, it's quite clear. So maybe I'd rate the book a 3 by itself, but a 5+ in combination with the FREE online videos. Strang is an outstanding lecturer.

This engineer is interested in the insight that maths can provide, not the proofs that can be written. This book aims for insight.

If you want to put the students to sleep, if you don't want your class to see past the proof then this is not the book for you.

I am a biology/pharmacy major. I am reading this book because of my interest in maths. I enjoy reading it because it is easy to understand and there is a lot exercises for me to practice. Some people think this book is not hard enough but I think Dr Strang did a good job. The target readers are general students. I have also been reading David Lays' "Introduction to linear algebra and its applications" and I prefer Dr Strang.

Very nicely written book. Prof. Strang focuses on one key idea at a time and includes plenty of exercises. To get a taste of the pace and the book's emphasis, I recommend watching Prof. Strang's lectures on YouTube.

I have found the flow of the so striking and the effect of it is almost immediate. This is a wonderful book and I recommend every serious learner of Linear Algebra to definitely have this book with him. No matter when but he will always find the book helpful.