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Welcome to the LaTeX community.

Please note that you are referring to lockstep's answer. And as egreg noted in his answer, eqnarray is obsolete for years.

Welcome to the forum. Try the Overleaf help instead. They can get direct access to your project and have a close look at the file.

We here on LaTeX.org could only guess what is going on.

https://en.wikibooks.org/wiki/LaTeX/How_to_get_help
Please follow the link and prepare a minimal working example: http://www.dickimaw-books.com/latex/min ... index.html

Welcome to the forum. Usually, one adds a minimal working example so we can reproduce your problem and figure out a solution for you.

Is there a URL? Or something containing a hyphen? Or something strange? I don't know, i cannot suggest anything without aforementioned example.

You did not provide a link to the class, so i used some version that was on my hard drive from sometime in the past. \documentclass{llncs} \begin{document} \title{My document} \newcounter{Section} \renewcommand{\theSection}{\Alph{Section}} \renewcommand{\thesection}{\theSection\arabic{section}} \new...

Have you checked with Springer? They decide over the layout.

Welcome to the forum.

I am sorry to say, that just from reading your code, i have no idea what your input, nor your output is looking like.
Can you add a small but compilable example that reproduces for us, what you see?

See https://tex.stackexchange.com/questions/498/mid-vertical-bar-vert-lvert-rvert-divides for the first question. What you need depends on the math you are doing. To the second question: There are no spaces in math mode as far as TeX is concerned. If you want a space, you need to use a special comma...

And where exactly is the problem? I think you are looking for \mid . \documentclass{article} \begin{document} Part a) zero conditional mean assumption，, $E(S\mid \epsilon=0)$ \end{document} Beware the difference between the comma as found on a regular keyboard and what you typed in. -> U...

Citation management software like Jabref can import entries from Google Scholar.