The Professional electronic edition comes as a personalized
high-quality PDF file that can be read, searched, annotated, and printed. The
cross-references in the text are active links: when a proof cites
"Lemma 3.1", for example, click on the "3.1" to be taken to that
lemma. For each result or proof, there are links in the margin to
take you to the results needed for this proof, or in whose proof the
current result is used.
The Professional edition is intended for personal use, and will
carry your name as its opening password. To use it on a computer,
all you need is to have Adobe's standard PDF reader installed; most
other PDF readers will work too. It can also be read on iOS or
Android tablets, such as the iPad, with the Bluefire Reader app. You
may keep and use separate copies on all your computers or devices
simultaneously, and print as much of the book and as often as you
like – including the entire book.
The Professional edition costs €53.45, the same as the printed book. This price includes free upgrades to all future editions.
If you would like to print handouts for a course you are teaching
from the book, you can get your Department to obtain a licence for
that too, see the link below.