Rainbow Connection :)

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Across
  1. 3. it is a number that can be expressed in the form p/q
  2. 5. it is a way in writing sets by listing all elements of the set
  3. 7. it is a set operation and is a set of all objects that are elements of either A or B
  4. 8. it is a set operation and is a set of all elements that belong to A but not to B
  5. 10. it is a property of real numbers in which the sum or the product of the real numbers is a real number
  6. 11. it is a well defined collection of objects
Down
  1. 1. it is a numbers set of irrational and rational numbers
  2. 2. these are numbers that cannot be expressed in p/q
  3. 4. it is a set of numbers that are classified into odd, even, prime and composite numbers
  4. 6. it is a way in writing sets by describing the elements of the set
  5. 9. it is a set with no elements