What is the hardest field of mathematics?

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Tags

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