MATHEMATICAL PUZZLE

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Across
  1. 3. SET, Set of all possible values
  2. 5. A collection of elements
  3. 6. Division
  4. 7. Infinite line
  5. 9. Form by two rays
  6. 12. ζ letter
  7. 14. Multiplication
  8. 15. LXXX
  9. 16. XVII
Down
  1. 1. λ letter
  2. 2. ^ symbol
  3. 4. Decimal separator
  4. 8. MARK, Rank of matrix A
  5. 10. ω letter
  6. 11. 1 turn = 360°
  7. 13. ~ symbol