11:32
There were 906 questions with deprecated tags a year ago. So the count decreased by 63 questions in one year.
abstract-algebra with 307 questions, 173 if we omit the most frequent algebra-related top-level tags and 95 questions with no top-level tags.
geometry with 377 questions, 227 if we omit frequent geometry-related top-level tags and 130 with no top-level tags at all.
discrete-mathematics contains 160 questions, 76 if we omit co.combinatorics, 38 with no top-level tag at all.
The are 165 questions where abstract-algebra was removed, 739 questions where geometry was removed 81 questions where discrete-mathematics was removed.
You can find queries returning those posts here: chat.stackexchange.com/transcript/message/49179918#49179918 You can even check which users have edited them away: chat.stackexchange.com/transcript/10243/2019/4/28
As I have mentioned before, it would be not difficult to prevent deprecated tags at least from being added to new questions: The existing deprecated tags should be blacklisted and Blacklisting (deprecated) tag while they still exist.
top-level-tags There are 103129 questions on the site, 80412 questions with a top-level tag, 85379 questions if we also count (linear-algebra), (graph-theory) and (set-theory).
top-level-tags 22.028% of questions without top-level tags, 17.211% of questions if we take the less strict interpretation.
Here are the links used to find the posts with top-level tags: chat.stackexchange.com/transcript/10243/2018/10/27
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