EQUIVALENCE OF FUNCTIONAL DEPENDENCIES
You will be given a relation (R) with different functional dependency sets X,Y of that relation , you need to check whether one functional dependency is a subset of other (X⊇Y/ Y"⊇"X ) or both are equal (X=Y). Consider X and Y are two FD sets for a relation R , 1)If all FDs of X can be determined from FDs that are present in Y , we can conclude that Y ⊇ X or X ⊆ Y (Y covers X) . 2)If all FDs of Y can be determined from FDs that are present in X , we can conclude X ⊇ Y or Y ⊆ X (X covers Y) . 3) If 1 and 2 are satisfied then ,we can say X=Y or X and Y are equivale nt .