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Across
  1. 3. Add the main diagonal
  2. 6. Dublin mathematician who vandalised a bridge with quaternions
  3. 7. The direction associated with the UCD School of Maths & Stats
  4. 9. One of the 7 impossible maths equations
  5. 11. Insert Equation Here
  6. 12. Known for his post bathing "Eureka!"
  7. 13. Distance from zero, in one sense
  8. 14. Namesake of the one-sided strip
  9. 15. Clock arithmetic, essentially
Down
  1. 1. Not expressible as p/q
  2. 2. Size of a set
  3. 3. Mathematician played by Cumberbatch
  4. 4. _____ up - Common MathSoc Team Name
  5. 5. Local polynomial approximation
  6. 8. Shares his name with a triangle, along with a famous Pedro
  7. 10. Indivisible, apart from the obvious two
  8. 12. Where a function may shoot off