Hi, I'm trying to learn using Mathematica and I can't figure out, how to insert a function into another function definition.
The result is
"Tag Plus is Protected."
I found some examples of this error like
But I can't see, how this is related, because I don't try to give a new definition to a protected symbol.
Sorry for a dumb question, but I'm used to work in Maple and it works there with no problem. Thanks for any advice.