Sure. The book is a sort of resource for learning the programming language Scheme, where the authors will present an illustrative piece of code and discuss different aspects of its behavior in the form of a question-and-answer dialogue with the reader.

In this case, the authors are discussing how to perform numerical comparisons using only a simple set of basic procedures, and they've come up with a method that has a subtle error. The lines above encourage the reader to figure out if and why it's an error.

With computers, it's really easy to just have a ha... (read more)