softcover/polytexnic — pull request #95 by mhartl (2013-12-30 19:05:02+00:00)
Title: 63077604 ensuremath

Something in the pipeline (probably kramdown) sometimes produces things like `\ensuremath{...}`. For example,
```text
a ~ b
```
becomes
```
a \ensuremath{\sim } b
```
It's also perfectly valid LaTeX, so we should support it.