This is one of the best books I have started reading for Linear Algebra.<br>Cause I am starting an M.Sc. in AI study I have searched for a comprehensive and clear introduction to Linear Algebra. Starting looking plenty of Mr. Gilbert Strangs video lessons 18.06 finally I found the best source to remember and improve the understanding of this very important field. In addition, I bought this new version of his LA books and I didn't regret it. One thing I have to mention for all of the people who are interesting to buy this book, too, is to see some of his lessons if you like the teaching style he is using, cause the book uses the same style and sometimes some things are not so clear when you read them first. But if you like it, I believe that this is the best source for Linear Algebra some can get.<br><br>Conclusion:<br>If you see all the lectures at 18.06 and read this book, you don't need any other sources to get a comprehensive understanding in Linear Algebra.