The author often uses the South Asian numbering system where, besides
the three least significant digits of the integer part, a comma divides
every two rather than every three digits (for example 10,00,000 instead
of 1,000,000). Italic text has been marked with _underscores_.
Inconsistencies in hyphenation and spelling have not been corrected. A
list of corrections to the text can be found at the end of the document.