A differential of the form

(1) 
is exact (also called a Total Differential) if is pathindependent. This will be true if

(2) 
so and must be of the form

(3) 
But

(4) 

(5) 
so

(6) 
See also Pfaffian Form, Inexact Differential
© 19969 Eric W. Weisstein
19990525