Suppose we have relation r(a, b,c, d,e), with some set of fd'sand we wish to project those fd's onto relation s(a, b,c). give thefd's that hold in s if the fd's for r are:
a)ab--> de, c--> e, d--> c, and e--> a
b)a--> d, bd--> e, ac--> e and de--> b
c)ab--> d, ac--> e, bc--> d, d--> a and e--> b
d) a--> b , b--> c, c--> d, d--> e and e--> a