1. | Let A and B be sets.Then A=B iff A belongs B |
A. |
B. |
2. | Let A and B be sets. A equals B,written A=B,iff every element of A is also an element of B,and conversely,every element of B is also an element of A. |
A. |
B. |
3. | 3 ∈{1,3,7} |
A. |
B. |
4. | N = {0, 1, 2, 3, . . .} is the set of integers. |
A. |
B. |
5. | Z = {. . . ,−2,−1, 0, 1, 2, . . .} is the set of integers. |
A. |
B. |
6. | All elements of all the sets under discussion belong to some universal set or universe . |
A. |
B. |
7. | For larger sets: |
A. |
B. |
C. |
8. | A set is: |
A. |
B. |
C. |
D. |
E. |
9. | Theorem. There is only one empty set,ie. only two empty sets are equal. |
A. |
B. |
10. | The emty set is the set containing no elements . |
A. |
B. |
11. | The symbol ∈ means: |
A. |
B. |
C. |
D. |