I'm typing a bold vector small x with a tilde sign above it. Now when I want to write its derivative, I'm putting a dot on top of everything. This is giving me problems and I found one solution:

```
\overset{\mathrm{\textbf .}}{\boldsymbol{\mathrm{\tilde{x}}}}
```

after I read this post: How to make a larger "\dot" .

This post has a solution for a similar problem: `\overset{\bm .}{a}`

To write bold mathematical symbols, such as vectors is `\boldsymbol`

better or do you recommend using the `bm`

package? I have always been using `\boldsymbol`

.

## Best Answer

If you take a look at the documentation for

`bm`

, it says that if the bold fonts are not allocated, it will use the correct symbolâ€”if it existsâ€”by using`\boldmath`

, but that this is slower. If there is not a bold version of the symbol, it uses poor man's bold.I think that in most cases, you want to use

`\bm`

.