LaTeX.org

Try this: \documentclass{article} \usepackage{amssymb} \usepackage{amsmath} \begin{document} \subsection*{Criterio di classificazione dei punti critici} Sia $C \subseteq \mathbb{R}^n$ un insieme compatto,\\ Sia $f: C \rightarrow \mathbb{R}$, continua in $C$ e dotata di gradiente per ogni punto inter...

Try the endfloat package, which was designed for this purpose.

That's not how that works. You can manually break the lines, but you have to keep track of it yourself. My suggestions: (1) change the margins, (2) change the text size, (3) change the size locally, just for that equation, or (4) define a new symbol, such as \mu_1 \equiv \cos\phi_1.

Change this:

to this:

Try removing the .aux file and any other generated files. This happens because the .aux file asks for something that doesn't exist. It would be overridden if TeX kept running, but it's aborted, so it stays...and a pattern forms.

I don't know if I actually understanding point #1, but I suggest you read the chapterbib documentation: if you want references on a per-chapter basis, they SHOULD start over, but you'll need to load it and read the parts about use with natbib. If you want a global bibliography, you need [rootbib] (s...

The glyph that comes with txfonts and newtxmath is slightly different than the one below (last stroke is a bit more curly, initial stroke thinner and at a different angle), but it depends on what you mean by "distinguish." I personally think the difference in the font you showed is similar...

It would involve writing a bibliography style file (*.bst) that only inserts the abstract. This could be done, but you'd have to write it yourself (it's not an everyday request).

I want what I described in my original post. Put another way: why would you want to do this? Reference lists are linked to specific documents (or portions of them). If you want to split up a PDF after the fact, that's one thing, but why would one document be completely divorced from its reference l...

You want "breaklines=true" inside lstset.