### Use LaTeX symbols (like \prime) in variables

So as we know declarations such as `theta=var("theta")`

when output as LaTeX, they're automatically converted to corresponding LaTeX symbols (`$\theta$`

in this case), but it makes me wonder is it possible for us to use more complicated symbols? Like `thetaprime=var("\\theta\\prime")`

(which obviously doesn't work, I've tried), but I would like to achieve something like this, so when I call `latex(eq)`

, all `thetaprime`

variables are converted to `$\theta\prime$`

.