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oh no wait... that was a mistake i made. everything's perfect now!

Thanks, Stefan! That got rid of the error.

However, it created a new problem. This is not a problem for my purposes, but it might not be acceptable for others who try this fix.

For some reason, even though I have the font set at 11pt, everything went to 10pt, throughout the entire document. Should ...

I'm getting an annoying error message when I try to change the text size of my chapter headings to the default text size when using amsbook. The resulting LaTeX source code is:

\chapter{{\normalsize INTRODUCTION: WHAT SOME THINK}}

Here's the error message:

---------------
The control sequence at ...