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### How could I attach a pdf file?

How could I attach a PDF file through my questions? Excuse me for this question, but I have much trouble to do this! Thank you very much.
408 views

This question was put on hold. That was a most unfortunate decision: the accepted answer makes the unnecessary assumption that the base field is algebraically closed and invokes the absurdly ...
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### Losing rep when a Q is removed

this post: 'How to Solve It: Add Your Heuristics' has been removed. I had an answer on it which made me 20rep, which I have now lost. But it wasn't my question, so why has my rep been lost?
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### What is unclear in 'what does the 1 mean?' [closed]

I do not understand why this was unilaterally closed as unclear. Some of the comments and the screenshot here are inaccurate. This was the original post that was closed, that you can see: differs ...
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### What happened to my question asking about the integral closure of an algebra of finite type over the ring of algebraic integers?

What happened to my question asking about the following question? It seems to be deleted. Why if that is the case? Let $A$ be the ring of algebraic integers in a finite dimensional algebraic number ...
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Recently we have seen quite a few instances of users editing questions that are closed to add their answers to the body of the questions themselves. That is a clear subversion of the rules and an ...
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### Is there an “undelete queue”?

Now Undeleted I have a question deleted by Community due to RemoveAbandonedClosed. I tried editing it so that it becomes on-topic, and I casted "undelete" and "...
184 views

### Enable FAQ sidebar on the meta

A little known feature of meta sites is that they can have a sidebar with a few most frequently asked questions: for example, Programmers Meta does. For a description of how it works, see FAQ ...
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### Appropriate way to place sound arguments when reopening a duplicate marked question

The possibility to reopen a duplicate marked question is a nice feature. This action is usually based (at least I do hope so) upon sound arguments. Is there a way to attach or combine these ...
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### What to do when OP deletes a question right after you have posted a correct answer [duplicate]

Just a moment ago I answered a basic question that involved finding the derivative of $\sin(1/x)$. A comment hinted at the chain rule, the likely best way of going about it. I took my time to spell ...
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### A few high quality duplicates

Suppose we have a small number of very close duplicates on some particular question. Suppose also that the questions are high quality and have high quality answers - at least, as measured by the ...
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### Metrics for questions

Lately I had a case that one of my questions was marked "as an exact duplicate". Projection, rotation and skew-symetry in N-dimensional space Commutativity of projection and rotation But what the ...
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### Should questions be marked as “duplicate” if answered before, but a possibly better/simpler approach now used?

How to prevent possibly better/simpler approaches to a previously answered question from getting buried as a duplicate question ? Number of ways to arrange identical coins in a ring