Question: Invalid Neutral Operator Error



I'm really not sure what else to say that isnt already obvious from the worksheet i uploaded, it's pretty obvious what i am trying to do i just dont understand what neutral operator even is, and couldn't find anything on the help page i was directed to by the error.




Join([convert(A, 'string'), "=", convert(B, 'string'), "(mod", convert(Set2[1], 'string'), ")"])

"A = B (mod Set2[1] )"



Error, invalid neutral operator






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