total differentiation

Posted by henry on Oct 09, 2011; 8:23am
URL: http://discussion-forum.276.s1.nabble.com/total-differentiation-tp6873893.html

To find the slope of the IS curve the product market equilibrium is totally differentiated and we get

dy= c'(dy-t'(dy) + i'(dr)

my question is what is total differentiation? and why there is no "d" before c, t, and i and to what respect they are differentiated if a " ' " on them represent differentiation