This iBook comes in fixed-format ePub, which conforms to Apple's
standard for iBooks but still looks exactly like the original PDF.
This ensures perfect layout as originally designed – quite unlike
the 'reflowable' maths books in the iBook store offered by the main
publishers. Unlike the other eBook editions, the iBook
has a linked index.
The cross-references in the text are active links: when a proof
cites Lemma 3.1, for example, tap 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. These links work best if magnified a little
The price for the eBook edition is the same in all three formats –
Standard eBook, iBook, and iOS app.