Mathematics general

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Feel free to post about mathematics in general, just keep the shitposting about 300k starting, CS, and stuff out of this thread. Let's actually talk about something meaningful this time.

>what are you currently reading?
>any problems?
>any suggestions for cool exercises?

Personally right now I am doing some reading in Kähler manifolds, in particular from the viewpoint of symplectic geometry.

I was wondering if anyone has any good books on differential equations as that has been a very abandoned subject for me since my undergraduate years. Maybe there is a good book in Springer's library? Thanks!