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Across
  1. 3. – Horizontal line of elements
  2. 6. – Diagonal 1s, rest 0s
  3. 9. – Equal to its transpose
  4. 10. – Vertical line of elements
  5. 11. – Rectangular arrangement of numbers
Down
  1. 1. – Single entry in a matrix
  2. 2. – Negative of its transpose
  3. 4. – Number of rows and columns
  4. 5. – Line from top-left to bottom-right
  5. 7. – Flip rows and columns
  6. 8. – All elements are 0
  7. 9. – Rows = Columns