Hi Denis, the underline indicates an exclusive OR rather than a "normal" OR. I may have actually seen that back in my college days but don't remember.
Manxman, how do you do that?
Click to reveal..
I guess you could break the V apart into two I's and then lay one on top of the other, or you could move the I on the far right on top of the left side of the V and make a sort of slanted and connected XI. Anyway, very clever!
Bob As I've grown older, I've found that my memory is not as good as I used to think it was.