Lots of different bits of maths are hard in their own way, and people find different areas easier or harder according to how their unique brains work! So for me, I found the really abstract stuff you learn at university hard (e.g. knots in 10 dimensions, what the meaning of a number is etc) whereas the applied side came much more naturally to me. But some people are the other way around!
I think each part of maths has it’s own challenges. Personally I find ‘pure’ maths quite hard as I don’t quite understand it and it can be very abstract.
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