[18335fall09] typo in ideal-cache handout

[Steven G. Johnson]

Hi gang,

There was a typo in the definitions of the O(...) etcetera asymptotic  
notations at the bottom of the ideal-cache handout on Friday - the  
formal definitions were missing absolute values |....| around the  
functions f(x) and g(x), and the restriction C > 0.  The corrected  
handout is posted on the course web page (under Lecture 2).

--SGJ