Mathematics

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Across
  1. 5. A ____ strip is a one sided surface you get by gluing together two sides of a tape
  2. 8. repeated exponentiation
  3. 9. Statement assumed to be true
  4. 10. The plus sign (+) originally stood for this Latin word
  5. 11. Less than zero
  6. 12. Ten to the power of hundred
  7. 13. Simplest platonic solid, triangular pyramid
  8. 16. The most beautiful equation in mathematics is named after whom?
  9. 17. Symbol used for the roots of numbers
  10. 18. Earliest known mathematician
  11. 19. A field of mathematics in which a donut and a cup are considered equal
Down
  1. 1. square root of minus one
  2. 2. Six-sided polygon
  3. 3. 2π
  4. 4. A statement thought to be true but which proof is not yet known
  5. 6. Platonic solid with the most sides
  6. 7. Numbers 2,13,57 are ____
  7. 14. Written at the end of a proof
  8. 15. Self-contradictory statement