Math Crossword Puzzle

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Across
  1. 7. Numeric value derived from a square matrix
  2. 9. Opposite in effect
  3. 10. Vertical arrangement in a matrix
  4. 11. Mirroring across a line
  5. 12. A set of equations to be solved together
  6. 15. Switching rows and columns in a matrix
Down
  1. 1. Combining quantities
  2. 2. Operations that do not follow the order
  3. 3. Turning around a point
  4. 4. Individual entry in a matrix
  5. 5. A special matrix with ones on the main diagonal
  6. 6. A number indicating the position or power
  7. 8. Measurements defining the extent of space
  8. 13. A real number
  9. 14. Horizontal arrangement in a matrix