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I have the following formula:

$$\bot \dashv\vdash \bot \land A  /* not derivable */$$

But the phrase /* not derivable */ doesn't show correctly. For example there is space between / and *, but no space between not and derivable.

How can I fix that?

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You seem to be using plain TeX so I'll stick to that, you can use \hbox to get back into text mode

  $$\bot \dashv\vdash \bot \land A  \qquad \hbox{/* not derivable */}$$
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If you want to use an embedded version, you can go:

$\bot \dashv\vdash \bot \land A $ not derivable
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