Christmas

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Across
  1. 4. int x^{1/ln(x)} dx
  2. 5. What's the one shape you should avoid at all costs?
  3. 6. What do you call a snake that is 3.14 meters long?
  4. 11. What’s sour, yellow, and equivalent to the Axiom of Choice?
  5. 13. What do you call a function that's always polite and well-behaved?
  6. 15. How is a PhD student in Theology like the Laplacian operator?
  7. 17. What is green and homeomorphic to the open unit interval?
  8. 18. What’s nutritious and commutes?
Down
  1. 1. “a mathematician is a device for turning coffee into theorems”. If the dual is taken: “a comathematician is a device for turning cotheorems into … “
  2. 2. Rebus 3
  3. 3. An expression to represent both the loss of a parrot and a geometric shape
  4. 6. Rebus 2
  5. 7. Rebus 1
  6. 8. If January 1st, 2023 is a Sunday, on which day of the week will December 31st, 2023 fall? (First 4 letters)
  7. 9. Who said Wir müssen wissen, wir werden wissen?
  8. 10. What sound does a drowning analytic number theorist make?
  9. 12. Have you heard the one about the statistician?
  10. 13. I am an odd number. Take away a letter and I become even. What number am I?
  11. 14. An appropriate title for a knight named Koal
  12. 16. What’s yellow, linear, normed, and complete?