● Fixed typos; non-standard spelling and dialect retained.
● ERRATA was corrected.
● Renumbered footnotes and moved them all to the end of the final
chapter.
● Enclosed italics font in _underscores_.
● Enclosed blackletter font in =equals=.
● The caret (^) is used to indicate superscript, whether applied to a
single character (as in 2^d) or to an entire expression (as in
1^{st}).