Provide the equivalent domain relational calculus and relational algebra expressions for each of the tuple relational calculus expressions given in Exercise 4.10.

(a) {H.hotelName | Hotel(H) ∧  H.city = ‘London’}

(b) {H.hotelName | Hotel(H) ∧  (($R) (Room(R) ∧ H.hotelNo = R.hotelNo∧ R.price > 50)} 

(c) {H.hotelName | Hotel (H) ∧ ($B) ($G) (Booking(B) ∧ Guest(G) ∧ H.hotelNo ∧ B.hotelNo = B.guestNo = G.guestNo = G.guestName = ‘John Smith’)}

(d) {H.hotelName, G.guestName, B1.dateFrom, B2.dateFrom | Hotel(H) ∧  Guest(G) ∧ Booking(B1) ∧ Booking(B2) ∧ H.hotelNo =  B1.hotelNo ∧ G.guestNo = B1.guestNo ∧   B2.hotelNo = B1.hotelNo ∧ B2.guestNo = B1.guestNo ∧ B2.dateFrom ≠ B1.dateFrom}