LyX ⇒ Assumptions numbered by Chapter

[NewLyxUser]

Hi,
I want to have all theorems/lemmas/etc numbered by type within chapters. I added modules: AMS,Numbered by Type and Numbered by Type within Chapters. Everything works as I want, except I am missing assumptions. When I add AMS-Extended, Numbered by Type, I have assumptions, except they are numbered 1,2,3,.. instead of 1.1,1.2,...,2.1, as I want.
I tried adding all kinds of definitions in the Preamble, but nothing works. How do I do it?
Thanks

[Stefan Kottwitz]

You could use the amsmath command \numberwithin, such as

Code: Select all

1
\numberwithin{assumption}{chapter}
 
 
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in the LyX document preamble, depending on you you named the assumptions and their counter, respectively.

Stefan