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Q&A about the site for researchers and developers who explore the principles of a system through analysis of its structure, function, and operation

SELECT q.Id as [Post Link], q.Tags, q.CreationDate, q.LastActivityDate
FROM Posts q INNER JOIN PostTags pt ON q.Id=pt.PostId
INNER JOIN Tags t ON t.id = pt.TagId
WHERE (t.TagName=##tag1:string?abstract-algebra##) OR 
  (t.TagName=##tag2:string?geometry##) OR
  (t.TagName=##tag3:string?discrete-mathematics##)
ORDER BY q.LastActivityDate DESC
---simply using "q.Tags LIKE '%<##Tagname##>%'" leads to some false positives
---for example, searching for geometry gives also the questions tagged geometry-of-numbers

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created may 5 Martin20528