Lectures in this directory as of 8/19/98 -- were copied
from /pub/ftp/pub/classes/6.042/fall97 -- with a date of February
1998.
Albert Meyer had taken Tom's lecture notes from fall97 -- and made
updates to them -- thus generating a date of February 1998.  In other
words -- Albert's lectures for spring 98 -- were not in the spring98
directory (except for a few, such as the marriage problem).