A Note About Conventions Used in This Book

In the writing of this book, we had to make several choices about style and convention. Some of our choices have surprised our readers. So, it is worth a few comments about why we have chosen to do what we have done.

Approach Rationale
First person voice This book is a collaborative effort between two authors. We debated and refined our ideas to find the best ways to explain these concepts. Alan tried them out in his courses and we refined some more. We chose to use the first person singular in the body of this book because it allows us to tell the story in what we hope is a more engaging and natural style.
Scanning text We have tried to make this book easy to scan so that you can get the main points ...

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