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  1.  
    If I type [ $k[x]_{x}$] , it renders as expected.But if I type[ $k[x]_{x}$ is $k[x]_{x}$], the rendering is completely botched.
    Could somebody please explain what is going on? Sorry if this has already been mentioned.
  2.  
    Because markdown interprets two _ signs as italics. That's the reason I have put some of my answers in backticks completely, as I grew tired of backticking every single formula.
  3.  

    Underscores (and asterisks) are parsed as MarkDown; they're both syntax for italics, and our rendering engine parses MarkDown before LaTeX. Escaping them with backslash, as in _, should fix it (and if not try the backticks).

  4.  

    To get rid of all Markdown formatting, the best strategy is to enclose the paragraph/answer in

    <p> ... </p>
    

    tags.

  5.  

    @darijgrinberg: what Andrew said. If you put the whole answer between backticks, the non-math part comes out monospaced, right?

  6.  
    Oh, I didn't know about <p>. Thanks Andrew!

    Everything between backticks comes out monospaced.
  7.  
    Thank you all, Andrew, Anton, darij and Qiaochu. And sorry for this late acknowledgment , due to some stupid confusion on my part (I had the false memory that I had not yet asked my question!).