Chapter 2.2, Problem 2MC

To determine

(a)

Whether the set of wealthy schoolteachers is well defined set or not.

To determine

(b)

Whether the set of great books is well defined set or not.

To determine

(c)

Whether the set of natural numbers greater than 100 is well defined or not.

To determine

(d)

Whether the sets of subsets of $\left\{1,2,3,4,5,6\right\}$ is well defined or not.

To determine

(e)

Whether the set $\left\{x|x\ne x\text{ and }x\in N\right\}$ is well defined set or not.