I am Xu Jinsheng (family name + given name). Welcome to my personal webpage. My friends normally call me Xu, as it makes lives easier.
Here, I record my thoughts on books, theorems, problems, etc. So, this website is my very portable notebook. Not all statements are guaranteed to be correct. In fact, I mostly start with things that I don't understand fully (otherwise, what's the point), so please criticise.

About me:

Current study (reviewing and learning):

I like algebra, analysis, logic, quality sleep, simple living, adventures.
I don't like texting.

Mathematics notes:

Some other notes:

Recording COVID-19 in Groningen.

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