# Question: let f be a function f x gt y and...

###### Question details

Let f be a function f: X --> Y and A and B subsets of X

a) Show, for all f, A, and B, that f[A] - f[B] f[A - B]

b) Show that if f is one-to-one, then f[A-B] = f[A] - f[B]

Let f be a function f: X --> Y and A and B subsets of X

a) Show, for all f, A, and B, that f[A] - f[B] f[A - B]

b) Show that if f is one-to-one, then f[A-B] = f[A] - f[B]