MATHS CROSSWORD PUZZLE

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Across
  1. 4. empty set
  2. 7. opposite of equality
  3. 8. π/180 of degree measure
  4. 10. arithmetic average of a set of given numbers
  5. 11. diagram for representing sets
  6. 12. well defined collection of objects
Down
  1. 1. law that defines a relationship between one variable and another variable
  2. 2. the set of all possible inputs for a function
  3. 3. the cumulative sum of a given sequence of terms
  4. 5. definite number of elements
  5. 6. A collection of facts
  6. 9. collection of ordered pairs containing one object from each set