_ should not be translated when in latex mode

```$$\bigcap_{x \in A} p_{x}A$$```
gets translated into

```\bigcap<em>{x \in A} p</em>{x}```

one has to add a \\_ to the latex to escape it, but it should be the default


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```$$\bigcap\_{x \in A} p\_{x}$$```
gets translated to 
```\bigcap_{x \in A} p_{x}```

which is correct