Linear algebra symbols

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Across
  1. 4. [ ]
  2. 5. ≫
  3. 7. ≪
  4. 9. ∑
  5. 10. x
Down
  1. 1. { }
  2. 2. ( )
  3. 3. ∝
  4. 6. ≡
  5. 8. ∞