Across
- 3. sweet mathematicians dream about
- 6. same on both sides
- 7. touch at only one point
- 9. meet only when right and not when wrong
- 11. a+b=b+a
- 15. rate of change
- 17. two circles and a flat curved surface
- 18. never meet
- 19. number six was afraid of
Down
- 1. double, double, and keep doubling until we run out of numbers
- 2. four equal sides that meet all wrong
- 4. part of the quadratic formula
- 5. special relation where each input value has at most one output value
- 8. climbed uphill then rollerbladed downhill
- 10. numbers that never terminate nor have a pattern
- 12. can't touch this, well usually not
- 13. numbers that are only divisible by one and itself
- 14. complimenti sinus
- 16. number system we imagine exists
- 17. pointy and great for ice cream