Across
- 4. the number of elements of a set.
- 5. a statement that is always false.
- 8. type of a diagram used to model sets.
- 9. a declarative sentence which is either true or false.
- 11. joining of two words using the word 'or'.
- 12. a statement that is always true.
- 13. a set that contains no elements.
Down
- 1. set of subsets.
- 2. an implication p -> q that can be proved by showing that if p is true then q is also true.
- 3. a statement that is neither true nor false.
- 6. the exact opposite of a statement.
- 7. elements that belong to two or more sets.
- 10. simplifying conditional or biconditional into basic form