I read on http://en.wikibooks.org/wiki/LaTeX/Mathematics:

The

`mathtools`

package fixes some`amsmath`

quirks and adds some useful

settings, symbols, and environments to`amsmath`

.

It sounds like "`mathtools`

has everything that `amsmath`

has and more", isn't it?

Are there cases when it is justified to use `amsmath`

instead of `mathtools`

?

In other words: Is `mathtools`

"always" better?

## Best Answer

I believe that the answer has been provided, mostly in the comments but here is a short summary:

The

`mathtools`

package loads the`amsmath`

package, if it has not already been loaded. This is common in many packages that need to ensure that dependencies are loaded. If you have a look in`mathtools.sty`

line 60, you will see:As such if you only load

`mathtools`

, you will have both packages loaded and you do not need to`\usepackage{amsmath}`

in your preamble. To see this you can run the following minimal:Certainly

`mathtools`

is not a replacement package for`amsmath`

. This is clear from the package author's comments in the abstract and the introduction:Hope the above will help you a bit more as to how to find your way around LaTeX and the many packages that are available.