$$

L

by an invoice ID number, an issue date, a payment type, a subtotal, a shipping cost, a tax amount,

and a total amount due. Each invoice is associated with some number of line items, which reflect

the quantity of an item ordered, the unit price, and the total price. Each line item, in turn, is

associated with a specific product, which is identified by a product number and has a

description, a unit price, and a quantity in stock. Draw the entities and the relationships between

them as a min$-$max ERD.

Using DeMorgan's Law, write an expression for the complement of F if

$F(w,x,y,z)=x{z}^{\text{'}}(x^{\text{'}}yz+x)+y(w^{\text{'}}z+x^{\text{'}})$