@ArturoMagidin I think you helped me in that time and I appreciate. Thanks very much.
I prefer entire TeX titles, I like enter in questions with this kind of title, but ok.
But it's strange, see my history edit. Take a look in edits before @J.M. edit.
First you edited my question removing
$$..$$ and putting
\displaystyle, in that moment I don't know why. But was missing
f in the equation, so I said I will edit. Than you edit first and wrote a comment.(So just read this comment after, I tryed edit but a message saying you have just edited appeared).
But $_p$ was missing in
f too, I'd forgot. So I edited again.
But see the
\displaystyle don't belongs my code, I never heard about it before. Than @J.M. edit my code removing this (at this point he thought I put
\displaystyle again, (what is obviously wrong) and comment with
Holy everloving... can't you listen?! Don't use \displaystyle in titles!!
I think it's quite rude.
@SrivatsanNarayanan comments too:
**Do not include equations ($$...$$) in the title, please!** Arturo corrected the title to remove the equation, but now it seems you have made it an equation again anyway
I'm new here and I want ask apologize if I did wrong things, but I would like have polite warnings too. Especially if the rebuke was wrong.