In this chapter, we have presented seven generalized entropies. Four of them are with one parameters and three are with two parameters. Including Shannon's entropy, in all, we have eight entropies. Now we shall present a logic i.e., relationship among these eight entropies.
We can write
The above logic have been adopted by Capocelli and Taneja (1985) 
to study the properties of the above eight entropies. This logic works
well specially towards inequality properties. The another approach of unification
by using continuity property with respect to the parameters, have been
applied by Taneja (1989) .