MATHEMATICAL PUZZLE

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123456789101112131415
Across
  1. 3. Multiplication
  2. 5. SET, Set of all possible values
  3. 8. LXXX
  4. 10. A collection of elements
  5. 12. 1 turn = 360°
  6. 13. λ letter
  7. 15. Form by two rays
Down
  1. 1. ^ symbol
  2. 2. Division
  3. 4. ~ symbol
  4. 6. MARK, Rank of matrix A
  5. 7. ζ letter
  6. 9. XVII
  7. 11. Decimal separator
  8. 13. Infinite line
  9. 14. ω letter