Arxiv - an Internet Archive for Scientific Articles
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Arxiv [https://arxiv.org] is an internet archive used for sharing scholarly 
articles. It is not an internet archive for any internet page. I guess that 
the X in the name is not really the letter X we know from English, but the 
Greek letter Chi.

You can find there articles categorized by fields and the fields are: Physics,
Mathematics, Computer Science, Quantitative Biology, Quantitative Finance,
Statistics, Electrical Engineering and Systems Science, and Electronics

The site works well without JavaScript, but does not render math well in
Emacs and Lynx browsers. At least from Lynx, you can download a PDF file.
But, I don't like how buttons are rendered in Lynx because I don't see labels
other from Buttons on them.

The first I've downloaded is About angles between vectors in a Banach space.
A Banach space is defined in a way similar to that of a Hilbert space, but
instead of an inner-product, it satisfies the triangle inequality.

To get there, I locate the Mathematics field, and click General Mathematics.
From the page loaded, I choose the article "arXiv:2605.00009" - Angles, 
orthogonality, and Pythagorean theorem in Banach spaces with two related 
applications
In parentheses, you can find links to the document in three formats: pdf,
html and other.

Following is a link to the abstract:
  [https://arxiv.org/abs/2605.00009] 

It also includes a search engine, but don't expect to find anything for 
beginners there. You are not taking courses there.