/sci/ - Science & Math

>>15255789
I have a 5.3 MB djvu version, "Paul Taylor-Practical Foundations of Mathematics.djvu"
If the record is straight, then I found it in September 2019 and this suggest it's still online somewhere.

It's a fantastic text. This is assuming you know what it's about. Depending on what you're actually interested in, I might have more suggestions.

>>15197487
I think differential equations is not a topic that's bad in this regard.
I.e. there's certainly math subject with "less systematic theory" than differential equations.
Just gotta learn Hilbert space theory, integral transforms and how the interact with the derivative, operator theory, special functions theory. It's pretty rich and fairly systematic, really.

>>15197610
Learning formal logic helped my quite a bit, but it's a somewhat long path if you're not motivated by the structure of logic itself.
Another silver lining is that it will inevitably make you opinionated on debatable topics that you can then shitpost about on /sci/