Sorry, no online dictionaries contain the exact phrase unsolved problem in mathematics.

Reverse dictionary results:
1. analyze
 2. example
3. sum
4. summing
5. captcha
6. quotient
7. moot
8. mooting
9. figure
10. figuring
 11. resolve
12. resolving
13. dyscalculia
14. work
15. domain
16. calculate
17. cohomology
18. formula
19. result
20. resulting
 21. connected
22. factor
23. interval
24. determine
25. determining
26. open
27. reduce
28. reduced
29. resolution
30. square
 31. clearing
32. schoolyard
33. algorithm
34. answer
35. answering
36. determination
37. solve
38. closed
39. develop
40. devil

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You can look up the words in the phrase individually using these links:   unsolved ?   problem ?   in ?   mathematics ?
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