What is the most difficult area of mathematics?

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Tags

1. #basically
2. #fields
3. #theory
4. #consider
5. #program
6. #geometry
7. #arithmetic
8. #langlands
9. #quiver
10. #start
11. #first
12. #where
13. #thinking
14. #difficult
15. #before
16. #sense
17. #arakelov