empty set in a sentence

Examples

1. Now, take any empty set ( S1 for example ).
2. The symbol for the null or empty set is either { } or ?
3. The empty set and " X " itself are always both closed and open.
4. This approach also provides the notation for the empty set.
5. In this context, zero is modelled by the empty set.
6. A triangular set may merely describe the empty set.
7. It is the number of bijections from one empty set to another, which is 1.
8. A player who cannot move because the choice is from the empty set has lost.
9. Similarly, is the th jump of the empty set.
10. Further the concept of the empty set exists to represent the absence of any items.