1. João

    Space left in-between exists because writing (e.g.) $var$ actually means “v times a times r”. Not knowing this is the source of many ill-looking papers out there, so this could be a great opportunity to show the difference between using $var$ and $\mathit{var}$ – thus showing how to properly typeset multiletter variables.

    • Hi!
      Thanks for the comment. \mathrm and \textrm (or \text implemented by the amsmath package) are similar, but not the same. A good discussion about the topic can be found here.

      Best, Tom.

  2. I’m using the amsmath package, and I tried to use \text in mathmode within my document’s title, but it caused errors, seemingly at the \tableofcontents line. I solved it by using \rm instead, but do you have any idea why it would cause an error?

    By the way, what is the difference between \rm and \textrm?

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