I have come across the same thing. It is from a chapter on probability.
If A and B are dependent events, then P(A and B) = P(A)*P(B | A)
1. Would you leave a space before and after the vertical bar?
2. Are letter signs needed for (A | B)?
Also, would you use a letter sign on the r in the fraction ?r radians/.p radians#
edited by crepemyrtle on 7/14/2015
edited by crepemyrtle on 7/16/2015