In https://math.stackexchange.com/a/1855782/4876 there is a missing closed bracket.
When I added it, I received "Edits must be at least 6 characters; is there something else to improve in this post?"
I have left a comment in the hope that the original answerer can correct this answer.
Why this restriction and how to deal with it?
Also, does this restriction apply to the original answerer?