LyX ⇒ Create Automated Numbered Text

[ld_pvl]

Hello,

I was wondering how we could create automated numbered text in LyX. For example, in my document, I would have different theories and lemmas, and I would like to have a command or something like that that would automatically count and label the theories and lemmas in the form of Theory #Chapter.#Counter such as so:

Chapter 1: Complex Numbers
...

Theory 1.1: xxx
Theory 1.2: yyy

Lemma 1.1: zzz

Chapter 2: High Order Differential Equations
...

Theory 2.1: aaa
Lemma 2.1: bbb

Many thanks for your help.