Here's what I have, and I've hand drawn what I seeking:

I'm after (a) a double-ended arrow with the two ends pointing to the numerator and denominator of a fraction under a square root, and (b) an arrow pointing to the double-ended arrow labeled by an `\otimes`

.

I'm typesetting old lecture notes in LaTeX and need to be as accurate as possible, so this is what I need to do. But it doesn't strike as straightforward.

I tried using `baseline`

in `tikz`

, but it didn't come out symmetric, and I wouldn't even know where to begin with the arrow pointing to the double-ended arrow.

```
\documentclass{article}
\usepackage{amsmath}
\usepackage{tikz}
\begin{document}
\begin{equation*}
\sqrt{\frac{N}{p(1-p)}}
\end{equation*}
\end{document}
```

## Best Answer

A solution that uses

`calc`

to determine the position of the double arrow:Some adjustments to tailor it to your liking:

`\leftarrow`

to`\longleftarrow`

`\color{}`

`distance=...`

`!.3!`

and`!.7!`

`-(.4,0)`

.Example: