This is one of my favorite books on math: It shows math Step by step and nice clear solutions. It has questions and solutions, not just answers. This is a wonderful book if your busy. Some math academics don't like this book because they want you to play games with stuff. If your studying Applied math , yeah go and prove all the equations till the cows come home. Theres lots of math books where you can play cat and mouse with theory. Anyway, Great for exam cram. Just WOW. All the editions of this book are good. This book will save you time so you can spend it else where. In addition to this book, you need to use MATLAB if your serious about solving math application type problems in control, comms, dsp.( there are some other computer math things about ). Its important to solve lots of questions. You won't be sorry if you buy this book.