Center-State Relationship:India

However,the Indian constitution does not introduce the term 'center' (in mathematics,we know the 'center' as a point which draws a perimeter around it) ,rather it is used by Indian Citizen.
Actually,Indian Constitution has used 'federal' word ,which means 'union of states' instead of 'center'.

There are three kinds of relations between center and state as legislative,administrative and financial relations respectively.

As per subjects,declared in union,state and concurrent list the differentiation of  duties splits.