If the domain and co-domain of a function are both the same set, then f is frequently called __________

Let E={x | x²–3x =-2}, F={2,1} and G={1,2,2, 1}. Which of the following is true?

The _______ of sets A and B is the set of elements which belong to A but which do not belong to B.

The real number c is less than the real number d if d-c is a _______ number

Let f assign to each real number its square, that is, for every real number x let f(x) =x2. The domain and co-domain of f are

A _________ number is a natural number, excluding 1, which is only divisible by 1 and itself

The set of all the elements which belong to sets D but not in the universal set is known as _________

One of the following is true

A set which contains no elements is called the _______ set

A simple and instructive way of illustrating the relationships between sets is in the use of ________________