More glossary items

[Greg Ewing (using news.cis.dfn.de)]

Cameron Laird wrote:
> There are other calculi--"quaternion calculus" and "vector 
> calculus" are two not-too-uncommonly-heard ones.

Indeed, in mathematics the word "calculus" really just
means a method of calculating something. It's actually
the Latin word for "stone", presumably dating back to
the time when people used stones as counters when
doing arithmetic.

-- 
Greg Ewing, Computer Science Dept,
University of Canterbury,	
Christchurch, New Zealand
http://www.cosc.canterbury.ac.nz/~greg