SETS

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Across
  1. 6. set of numbers that start from 0
  2. 8. a set which has no member
  3. 9. every object which is included in a set
  4. 10. a set may be expressed using this kind of bracket
Down
  1. 1. set of numbers that start from 1
  2. 2. numbers which have more than two factors
  3. 3. one of three ways to describe a set
  4. 4. a set which contains all members of the sets under consideration
  5. 5. numbers which have exactly two factors
  6. 7. collection of objects which can be clearly defined