Assignment

Consider the following statement. You will be writing a proof showing that it is true. 

For all sets X, Y, and Z subsets of a universal set U

(X -- Y)  ∩  (Z -- Y) = (X  ∩  Z) -- Y

Notes: 

1. Use an element argument, see page 356 in the textbook.

2. Write or type your work neatly and completely.