how good is "good"? Calculus, but too any Math or Science book How good is "good" when someone wants a book on any course, such as Calculuses one through three or more or Linear Algebra? The recent topic is in progress for "what is a good Calculus book", and it seems there are different opinions based on students' goals and the nature of the textbook and how well the style fits the student. Currently my favorite Calculus 1 book is Single Variable Calculus, Fourth Edition, by James Stewart, (c) 1999. One reason I like it is that it includes a very good, maybe excellent proof of the Chain Rule. The treatment of Fundamental Theorem of Calculus is also very good and has helped me to understand this better. I had previously believed certain other books were just as good or even better, but I no longer believe so. An old, big thick, Anton book on Calculus has a great many exercises and examples and seems to have good instructive discussion but some of the proofs are lacking or too difficult to follow. The old Larson & Hostetler book was very well designed to help students learn to use Calculus as a tool, but some of the development still seems lacking in proofs. I have never ever seen the Courant nor Apostel nor Spivak books, so I do not know how they are. While I say the Stewart book is very good/excellent, I cannot say that the Larson&Hostetler nor Anton books are bad; only that I LIKE the Stewart book better. All three were meant for undergraduates who need a Calculus & Analytic Geometry course series for degrees in physical sciences and engineering. So how good in what way are the popular and less well known books for Calculus, Linear Algebra, Differential Equations, or any other Mathematics or science textbooks?