What should I print out?
The webbook is a work in progress and in constant flux; probably it is wisest to browse a chapter of possible interest with a pdf previewer, before deciding to print anything. Printing the entire book will take down a tree in the Amazon.
The chapters are updated as we revise them, with the revisions date at the bottom line of every page except the first page in a chapter.
The lecture symbol overhead takes you to a set of overheads that might give you a quick impression of the main results of a given chapter.
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