I have an answer here: https://math.stackexchange.com/a/3477238/633100. It just got an unexpected downvote but no one ever left a comment on why the downvote was casted, a comment was there but was very vaguely stated. I see that lot of queries like these arise at Meta and wish to know why I got downvotes.
How can this answer be improved. Is it okay to leave Random downvotes like these without justification? What might be the reason for such downvote.