Set theory symbols

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Across
  1. 3. ∝
  2. 5. (a,b)
  3. 7. (x)
  4. 9. ≡
  5. 10. ∑∑
Down
  1. 1. (f ∘g) (x) = f (g(x))
  2. 2. ⌈x⌉
  3. 4. ≈
  4. 6. ( )
  5. 8. ∆