See the official list:
Only awarded to anyone after each of the 40 top tags has at least 200 questions
We don't fulfill this criterion yet:
our 40th largest tag (4th on page 2 of the tag list) only has 119 questions.
As Peter points out in the comments, the issue in the linked post is about combining primes with carets (^). The expression q^'_0 is invalid LaTeX (it produces an error message even in LaTeX). Version 2.0 incorrectly processed this expression, but that was fixed in version 2.1, which was released back in October of 2012 (a few months after the post you ...
You have asked two questions before. Both received downvotes, and one was closed as offtopic. Both have been deleted in the meantime, but the system still "sees" them.
That said, I don't know in which way the system punishes overall behaviour on the network as a whole. Messages such as these are the result of heuristics the details of which are not ...
< is also the starting character of any HTML tag - which a subset of is allowed in markdown.
As such - it isn't escaped by the parser - and your browser thinks that everthing after < (until a > is reached) is a tag. So isn't shown on the page.
Solution? When posting math, use math formatting, as in the edited post.
Duplicate closure only works within one site. This is by design: similar questions in different communities are likely to receive different answers. For more information, see What to do with cross-site duplicates? on the main meta.
We request that people not to ask the same question on multiple sites. In this case, the normal protocol on most sites is to ...