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Dear Stefan ,

thanks for your help .

But I continue with a problem in cross-references. Apparently the \ref command does not recognize the numbering created with the \newcounter command.

As you can see in the final part of the attached image, all references are made to Theorem 1.2, however ...

Of course, here the detail

as you can see in the attached image, at the end of the image, appears twice: "See Theorem 1.2".

The problem is that you should see
"See Theorem 1.1" and
"See Theorem 1.2"

as expected by the code used.

\begin{teorema}{}
\label{teo1}
Sea X una variable aleatoria ...

Dear community,

My question is about the template legrand-orange-book, some could say how the references work in this template.

It seems to me that the newcounter and newtcolorbox commands modify the way you use the references.

I hope we can talk about this topic.

Greetings.