can anyone do this question, im really stuck:
Alan, Barbara, Charles ara chooses Colin Dexter
and Jane Austen, Charles chooses dicck Francis, Colin Dexter and Terry Pratchett, and Deborah chooses Jane Austen and Terry Pratchett.
(a) Denoting the shere l, d, a, f and p stand for Robert Ludlum, Colin
(b) Explain w between people and authors.
(c) Use projection and inverse projectiochosen by Barbara.
(d) Use projectssion for all the readers choosing both dicck
Francis and Robert Ludlum.