Added to LaTeX troubleshooting

Author: TimChild

Export Troubleshooting.md

@@ -5,15 +5,18 @@
 
     a. If any images were previously inserted like `![](https://drive.google.com/uc?export=view&id=...)` it may be necessary to COPY ALL WORK into a new notebook because some information gets stored in the background of a `.ipynb` file, and I have seen at least 1 case of this causing problems even once the offending line is removed.
 
-3. LaTeX issues -- See below for LaTeX specific tips.
+3. LaTeX issues (often shows an error like `! Missing $ inserted.`) -- See below for LaTeX specific tips.
 
 4. Make a new `.ipynb` file and copy across cells a few at a time, making sure you can export the new `.ipynb` as you go. That will help narrow down which cell has a problem if it has been difficult to find so far. 
 
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 ## LaTeX
 The way Jupyter/Colab interprets markdown cells is slightly different to how the LaTeX compiler reads them, and unfortunately for us, the Jupyter/Colab interpreter is smarter than the LaTeX one, which means that even though things look great in the notebook, they might fail while exporting. 
-So far, the things I have found to cause issues are:
-* Spaces inside of `$` signs... e.g. `$ 50\pm10 $` won't compile, but `$50\pm10$` will. 
-* Opening and closing many `$latex$` sections in one sentence seems to cause issues sometimes... e.g. avoid things like `$10\pm$5+$\mu$=40$\pm7$E$10$`
-* If you use are using something like `\begin{align} ... \end{align`} (which defines a LaTeX enclosure) then you should NOT use `$` signs as well.
+Some just do not render correctly:
+* Inline text with a space at the end (e.g. `$5.0 $`). Will render as LaTeX in colab, but as regular text including "$" in export
+
+Some cause the export to crash:
+* Empty LaTeX (e.g. `$$` or `$$$$`). Will show up as empty space in Colab, but causes export to crash with `! Missing $ inserted.`
+* Numbers directly after a closing `$` without a space first (e.g. `$10\pm$5`). Will render in Colab, but causes export to crash with `! Missing $ inserted.`
+* Using `$` inside of a `\begin{equation}...` style LaTeX. Probably will not render correctly in Colab, and can cause a variety of export issues. Just stick to the `$1=1$` or `$$1=1$$` style LaTeX.