# \renewcommand conflicts with ams?

I am trying to alter the format of section headings. I have something like
```
```
```\renewcommand{\subsection}{ %
\...@startsection{subsection}{2}{0pt} %
{1.1ex plus 2.0ex minus 1ex}%
{1.2ex plus 2.0ex minus 1ex} %
{\bfseries} %
}
```
```
```
However, if I the AMS math package gets included by LyX, then any subsection* constructs break. Is this a known conflict with AMS?
```
A simple recipe to reproduce:

1. add the above "renewcommand" to the document LaTeX preamble.
2. create a subsection and subsection* environment
3. In document settings -> math options, disable AMS.

This compiles fine.

```
Now replace step 3 above by enabling AMS. Now the subsection* environments are broken.
```
```
I have attached a simple LyX file that can serve as a basis for testing. It is currently configured to break.

newfile2.lyx
Description: Binary data

```
```