This book is intended as a "refresher' course in mathematics for scientists, engineers, and technicians. It begins with a review of arithmetic, and progresses through intermediate and advanced topics, including algebra, trigonometry, geometry, coordinate systems, calculus, differential equations, complex numbers, series, logarithms, and digital logic. It is assumed that you have already been exposed to the topics in this book. If you haven't — for example, if you have never before seen calculus — you should take a basic course on that subject first, and use this book as a supplement and as a future reference. But maybe you took calculus in college, and that was 20 years ago! The concepts are still in your mind, but they're no longer right up in front. In that case, this book can bring things back to the surface, so you can again work easily with concepts you learned a long time ago.