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Crossword solution:

14 clues for "QED":

  1. Proven!
  2. Geometry abbreviation
  3. Latin abbreviation
  4. Mathematician's abbreviation
  5. Math initials
  6. 'And that proves it'
  7. And there you have it! to a mathematician
  8. Latin abbreviation used in math
  9. Mathematician's "ta-da"
  10. Proved, in math.
  11. "Proved!" letters
  12. Proven, in proofs
  13. Relative of 'Voila!'
  14. That which was to be demonstrated, in proofs