I have free time and i want to improve my LaTeX skill, is there

>>9158310
There are multiple online databases of information. Look for them. The best thing to do is get a research paper and try to translate it to latex on your own.

Just because a book has been uploaded to the internet as a series of scans, and thus been "digitized" in a definite sense, or even packaged as .pdf(s), does not mean the book has been punched up as a series of TeX files.

You could really pick anything. As an extreme and irrelevant example (against your point), I don't think Principia Mathematica has ever been tex'd by anyone, which might actually improve its readability somewhat (the notation is notoriously ugly).

>>9158322
>Principia Mathematica
What a useless piece of shit of a book.
Pick something people would use OP.

>>9158771
t. godel

bump for ideas

>>9158310
Apostol.
The current pdf that you can find on libgen have a fuckton of problems.