@dharr Hello, it worked! I did as you told me, I used "restart" at the beginning of each section.
Thanks for your help my friend!

@dharr 

I apologize for the confusion with the nomenclature. I was referring to the name that comes before ":=".

I understood your proposal and I understand that if you change the name to, for example, "b1", the problem will be solved, but my case is more complicated.

My doctoral advisor wants to review the calculations of some files, and asked me to put them in a single file, in the form of "Sections" that can be hidden or collapsed.

My problem is that I usually give the equations the same names, and each file has on average 80 equations! And it is a lot of work to rename each equation, and with the risk of making mistakes.

I also asked the Gemini artificial intelligence: "How to create a session without MAPLE without the equations conflicting with the main file?"

And the answer was:

But it didn't work.

I'm afraid I'll have to follow your advice and copy the contents of the files and generate a Section with each one, but I should tell my advisor not to run the entire file with the "!!!".

I still haven't achieved what I wanted, but thanks for the help anyway!

@dharr 

Hello! Thank you for answering me.
I use Maple 2018.

In the attached example, the equation in the original file is called "a1", which is x^2.

The created Section has an equation with the same label "a1", and it is 3*x.

When I close the Section and continue with the original file, if I write "2*a1", MAPLE gives the answer 6*x, understanding that I am referring to the equation "a1" that is in the Section, and not in the original file.

How can I solve this?