Interpret (...1...) and (...2...) in output of symbolic expression?

Hello everyone-

I am having a problem with the output of some of my symbolic expressions. I am working with lengthy equations and Mathematica doesn’t return the full expression for the output. Instead, it will write a combination of the output with (…1…), (…2…), etc. I have attached a screenshot of an exemple below. Does anyone know what the (…1…) and others mean?

Best,

Basically it is “n elements” that are omitted to only show a bit of the result. Click on “show all” to show everything…

very similar to Skeleton…

Thank you for your reply.

I looked at the Skeleton function; I didn’t know about it.
I’ve noticed that the (…1…) expression appears a few times. Are all the (…1…) in the expression equal? In which case it is logical for Mathematica to “factorize” it out? Or is it not the case?

no, just a sequence of elements that are in between. The number in the middle is not a tag for similar items, just how many items are not displayed (could be elements in a list or terms in a sum or …)