Hi
Most times, a plus in a circle is to indicate an exclusive-or.
Dwight
Oops! That's right. And just to add more wonder, another book I was looking
at uses a "V" looking symbol and an inverted "V". These are also
defined as
"∨" and "∧" in HTML 4.0, although my browser
doesn't seem to display
them. Does their adoption as standard entities mean these are "standard"
international symbols? --Patrick