Linear Algebra Symbol

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Across
  1. 5. is a symbol that represents a mathematical object
  2. 6. ⊂
  3. 7. ∆
  4. 8. ≡
  5. 9. π
  6. 10. √
Down
  1. 1. [ ]
  2. 2. ⌈x⌉
  3. 3. ( )
  4. 4. ⌊x⌋