Question: 1. What does it mean to say that two sets S1 and S2 of FDs are equivalent?
2. What does it mean to say that a set of FDs is irreducible?
3. Here are two sets of FDs for a relation R1A,B.C,DEI Are they equivalent?
1. A → B AB → C D → AC D → E
2. A → BC D → AE
4. Here is a set of FDs for relation R(A,B,C,D,EF):
AB → C
C → A
BC → D
ACD → B
BE → C
CF → BD
D → EF
Find an irreducible cover for this set of FDs.