<P>Problem 26 of Supplementary Exercises of Chapter 1
<P>Express the statement .Every student in this class has taken some course in every department in the school of 
mathematical sciences.
	s = student 
	c = course 
	d = department 
	P(s,c) s is a student of c 
	Q(c,d)	c is a course in d 
Vs 3c Vd (P(s,c) ^ Q(c,d))