A number of typographical errors have been maintained in this version
of this book. They have been marked with a [TN-#], which refers to a
description in the complete list found at the end of the text.
Text surrounded with ~ was originally printed in Greek.
The following codes for less common characters were used:
[=a] a with macron
[=u] u with macron
+ dagger
++ double dagger
|| double vertical line