Across
- 1. a set with only 1 element
- 4. diagram which shows a set graphically
- 5. marked by the character '-'
- 6. the theory that cantor discovered
- 7. marked by the character 'U'
Down
- 2. marked by the character '∩'
- 3. the country cantor belonged to
- 8. a set with nothing in it