I recently encountered the following edit of a question: https://math.stackexchange.com/revisions/4126525/2
I hope everyone here agrees that the edit is not appropriate. A minor thing is that editing "fi" to $fi$ is not really helping the question, and the correct way of way would be to change it to $\phi$ or $\varphi$, but what is worse is that the exponentiation is not edited correctly, nor are the curly braces. Overall, I strongly believe that the edit is harmful, as before it, the question was more readable than before. For example, the line
x ≡ 27 * 12 ^(fi(7)-1) ≡ 6*(-2)^5 ≡ -(-2)^5 = 25 = 32 ≡ 4 (mod 7)
was edited to $$x ≡ 27 * 12 ^(fi(7)-1) ≡ 6*(-2)^5 ≡ -(-2)^5 = 25 = 32 ≡ 4 (mod 7)$$
(note the $fi$ and how the only character in the exponent is "$($", both mistakes much worse than the original formatting) while
x ∈ {4, 11, 18}
became $$x ∈ {4, 11, 18}$$
which is just nonsensical.
The edit is basically a "just add dollar signs" edit, which should be rejected as per site policy discussed here.
My question is, what is the proper course of action when one finds edits like this? Naturally, the first thing is to fix them, sure, but what then? The thing is that this edit was made by a junior user, but also approved by two more senior users. I am not looking for a way to punish them, but it would be nice if they got some sort of heads up to know that they messed up. The thing is that the edit is already accepted, so I cannot flag or reject it, is there any other way?
(mod 17)
to\pmod{17}
or adding\{
where{
was in just text) should be declined categorically. $\endgroup$