Simplified, mathematics is the study of numbers, patterns, space and change; but this is merely the tip of the spaceship - or the helicopter, the layout of the soccer field for next Saturday's game, the architecture of a new building, or new experiments..

- Calculus On-Line TextbookPublished in 1991 by Wellesley-Cambridge Press, the book is a useful resource for educators and self-learners alike. It is well organized, covers single variable and multivariable calculus in depth, and is rich with applications. There is also an online Instructor's Manual and a student Study Guide.
- Calculus on the WebCOW is an internet utility for learning and practicing calculus.

The COW library is organized into books, chapters and sections, with "modules" covering topics generally found in the corresponding part of a calculus text.