I came across a late answer by a new user to a question, which I link here; and I have a dilemma how to respond.
- The formatting was pretty bad (read: non-existent), so I edited it and commented, suggesting the user to learn mathjax.
- However, this is not the only problem. The answer essentially contains a replication of the work shown by the OP. There is no other new material, or any new ideas which could help people. I feel like I need to downvote, but at the same time, I also realise that a new user may be trying to gain confidence in using this site by answering some questions known to them.
So my question is : should I downvote, or not? Just to note, the question is NOT a PSQ.