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Questions tagged [exact-duplicates]

This tag is referring to the process of identifying and closing questions that are exact duplicates of another question.

81
votes
10answers
7k views

Coping with *abstract* duplicate questions.

Any longtime reader cannot help but notice that we get many abstract duplicate questions, e.g. this recent question on partial fraction computation, which is not essentially different from many other ...
11
votes
1answer
355 views

Original post marked as duplicate

I was just asked to review a question that was posted in 2010, and that has now been closed as a duplicate of a more recent post (this was closed in favour of this). Is it normal and/or accepted for ...
20
votes
2answers
608 views

How do you search for duplicates?

Sometimes I am really surprised how fast are the duplicates of new question found, given that we have vast amount of questions here. I hope posting this question here can be useful and can lead to ...
6
votes
2answers
260 views

Closing as a duplicate if the post contains OP's own proof/solution

It is generally agreed that good question should also indicate what the OP have tried. Many people do this and we receive many questions also contain the OP's attempted proof/solution for the question ...
8
votes
1answer
376 views

Avoiding duplicates

I was wondering if I could ask a question on meta whether some question is on the site or not. I'm asking this since sometimes one might ask a duplicate question which he/she searched for and didn't ...
18
votes
5answers
982 views

How close a match we need to close a recurring question as a duplicate?

An hour ago I closed a question as a duplicate of an, in my opinion appropriate, generic question. Two gold badge holders have since expressed disagreement with my decision, and the question has since ...
14
votes
2answers
388 views

Proof-verification and duplicates.

When someone posts a question, which asks for verification of their proof of something, the mathematical content of that question will often be a duplicate of another question. Now, in order to help ...
14
votes
5answers
241 views

What to do with a newer post and a related, older, less thorough post?

Let me give a specific example. Today, I answered this post, and my answer seemed familiar. Looking through my old answers, I found that I'd answered this post a while back. The older post is a less ...
14
votes
7answers
1k views

The duplicate thread

This thread is intended to help with closure of duplicates. The main use case are situations where a first attempt at duplicate closure was not successful.1 The creation of this thread was decided ...
5
votes
1answer
152 views

What is the difference between voting to close as a duplicate and flagging as a duplicate?

I am aware that to flag you only need 15 reputation points. Only users with 3k+ reputation can cast votes. If a post is flagged as duplicate, what happens then? In particular, what is different from ...
8
votes
2answers
323 views

Duplicate banner breaks LaTeX

On several recent occasions, after closing a question as a possible duplicate the automatic banner breaks the $\LaTeX$ requiring manual intervening. I don't recall it was like that before, and I ...
2
votes
1answer
176 views

Topics declared as duplicates in which order? [duplicate]

I'm asking this because I think an older question with a full answer shouldn't be declared a duplicate to a newer one. What the moderators think about this?
14
votes
4answers
737 views

downvoting because of duplication?

This question has five downvotes, and was closed as a duplicate of a question with 25 up-votes. Should one down-vote a question merely because of duplication? There's no mention of anything wrong ...
24
votes
1answer
474 views

Allow closing as duplicate for new questions

One of the changes to the closure system in the recent revamp was that to close something as a duplicate, the suggested duplicate needs to have an upvoted answer. I suppose that's a good thing when ...
6
votes
1answer
464 views

What should I do when I find circularity among duplicates?

Occasionally, when trying to vote to close some question, you get the error message: ...
24
votes
2answers
424 views

Should we close questions asking for hints as duplicates?

This question was inspired by this question Relationship between $\operatorname{ord}(ab), \operatorname{ord}(a)$, and $\operatorname{ord}(b)$, which I first came across while reviewing close votes. ...
18
votes
1answer
308 views

Duplicate of a deleted question

I just came across this question, and it made me wonder what the policy is for deleting questions which have duplicates pointing to them. I don't have any particular stake in this specific question, ...
9
votes
1answer
259 views

Loop of duplicate posts

These two identical questions were asked by the same user (the first one was migrated from MO actually): https://math.stackexchange.com/questions/582151/lrs-over-finite-fields https://math....
4
votes
3answers
464 views

What to do in case of unsuccessful duplicate close vote (or flag)?

Consider a situation when a user votes to close a question as duplicate (or flags it as a duplicate if they do not have sufficient rep to cast close votes), and then the post is not closed. If the ...
3
votes
1answer
104 views

How should we handle cross-site duplicates?

There are some questions which are answered quite well by a nearly-identical question on another site (say, computer science's stack exchange, or math overflow). Should those questions get answers ...
11
votes
1answer
273 views

Duplicate Titles needing improvement and/or closed as duplicate

Inspired by a similar question on meta.stackoverflow, I just did this database query on math.se, and found 81 pairs of questions with totally identical title. (Ordered pairs where id1 < id2, ...
27
votes
1answer
473 views

Whither the duplicate?

Ironically, I'll bet this question is a duplicate of other questions regarding duplicates, but I see little harm in sparking some new conversation here, even if we tread over old ground that many ...
8
votes
0answers
124 views

Clarification of what should be closed as a duplicate [duplicate]

Until today the word "duplicate" was clear to me, or so I thought, but I have just been confronted with the following situation: there is a question A from 2011 (with an accepted answer) and one other,...
3
votes
1answer
111 views

Duplicates with no answers

I was trying to flag this question as a duplicate of this question, (same question, same asker). But the system would not take the original question because it says it has no upvoted answer. What is ...
8
votes
1answer
209 views

Closing duplicate questions by the same poster

To close a question as duplicate it is now suggested that the original question should have an answer "this question has been asked before and already has an answer". Another circumstance arises quite ...
5
votes
1answer
406 views

Totally similar questions are not closed for years

Today, recently viewed this post on combinatorics asking to prove the famous result "If $p$ is a prime, then $p|{p\choose k}, k\in \{1,2,\dots,p-1\}$". I was fairly sure that, It should have been ...
3
votes
1answer
156 views

Why my duplicate flag is declined?

Aren't these questions similar? Factorial Proof by Induction Question: $ \frac1{2!} + \frac2{3!} + \dots+ \frac{n}{(n+1)!} = 1 - \frac1{(n+1)!} $? Prove if $n \in \mathbb N$, then $\frac{1}{2!}+\...
3
votes
1answer
207 views

How can a proof-verification question be closed as a duplicate? [duplicate]

Consider a question of this type: “My task is to prove […]. Here's my attempt: […] Is my approach correct?” I've seen several questions like this being closed as duplicates. ...
3
votes
1answer
94 views

Of which question is this question duplicate?

This question "Direct proof that $\sqrt{2}$ is irrational?" is marked as duplicate. In other duplicate questions, there is a link to the original question but not in this question. So where is ...
32
votes
0answers
338 views

Improving the search system

When recognizing some questions as duplicates, sometimes it is difficult to find the original question one remembers. For instance, I recently saw a question asking to prove that $$\forall x\in(-1,1),\...
27
votes
1answer
2k views

Same person has asked the same question 6 (!) times - what can be done?

I have flagged 4 exact duplicates yesterday https://math.stackexchange.com/users/flag-summary/86800 leaving only one version Integers and integer functions And today a yet another exact duplicate ...
24
votes
1answer
642 views

Why do obvious duplicate questions on MSE get upvoted, answered, and their answers upvoted?

The title is the question: why do obvious duplicate questions on MSE get upvoted, answered, and their answers upvoted? And what can be done to prevent this? Here is an example: https://math....
17
votes
1answer
329 views

Meta-Meta question: Duplicate for previous question without actual real answer

So I was perusing the meta site, and I came across this closed link: https://math.meta.stackexchange.com/questions/20285/why-do-we-have-a-tag-called-stochastic-analysis The reason it was closed was ...
21
votes
0answers
354 views

questions asked over 100 times

I just saw another question with the limit of $(1 + 1/n)^n.$ A few months ago, somebody asked some other multiple repeat question, I wrote to check any of the last 137 times it had been asked. he ...
12
votes
1answer
384 views

Is it okay to delete unanswered, marked as duplicates questions?

Just what the title says: I've had many questions marked as duplicates when I first started using this site, and I was wondering if it's okay for me to delete them.
11
votes
4answers
502 views

Should this question be closed as duplicate?

Here we have an interesting situation: the question Is an algebraic integer all of whose conjugates have absolute value 1 a root of unity? was asked. While there doesn't seem to be an exact ...
10
votes
1answer
142 views

When, and how, to suggest merging of questions?

Background Just today, we had the following situation: Proving by induction that $n^{n+1} > (n+1)^n$ for $n \ge 3$ Prove by induction that for all $n \geq 3$: $n^{n+1} > (n+1)^n$ Usually, I ...
6
votes
0answers
121 views

LaTeX a jumbled mess when flagging as a duplicated

Is it normal for the LaTeX to be a jumbled mess when flagging as a duplicate? In case it isn't all systems, I am on a Linux system with Firefox 34.0.
3
votes
3answers
245 views

Thread - Request Mergers of Very Similar Questions

Would something perennial like Requests for Reopen & Undeletion Votes, etc. (volume 10/2012 - 12/2014) help? Example: ♦ $\sqrt{x}$$\sqrt{x}$ = $x$ but $\sqrt{x^2}$ = $|x|$. Why?, ♦ What's ...
3
votes
0answers
176 views

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 ...
0
votes
0answers
52 views

Drawing attention to a question in another StackExchange site

I asked a question in CrossValidated Stack Exchange site because it deals with probability distributions. But it is a theoretical question (although I think it does not involve high-level maths). I am ...
28
votes
4answers
471 views

Voting to close as duplicate without taking the time to check if they are

This question has 4 votes to close as being an exact duplicate of this one. Within an hour of the question being asked, someone voted to close it as an exact duplicate AND Davide Giraudo pointed out, ...
20
votes
3answers
725 views

Should duplicate questions be deleted?

Lately, I came across several suggestions for deletion of questions simply because they are duplicates. In my opininion: If the question is somehow a bad question, then it ought to be deleted, and so ...
13
votes
1answer
337 views

On the correct procedure after answering a quadruplicate question

Okay, so I just answered this question, and after answering read the "related" section and noticed that the answer had already been asked several times: 1, 2, 3, 4. Now I am not sure what to do, ...
12
votes
3answers
347 views

Handling users asking lots of similar questions with little work

I realize that one of the major goals of this site is to help others learn and understand mathematics, and in fact it is one of my favorite parts of math.SE. As such, I don't mind a bit when I see a ...
11
votes
3answers
337 views

What action to take on identical questions from the same user?

It sometimes happens that the same user posts exactly the same question twice in a row. Examples: 1 2. user asked twice for the probability of choosing 90% of the colors from a collection of $10^{...
10
votes
1answer
543 views

Should identical answers on questions which are abstract duplicates of each other be allowed?

Let's say that a question is posted, asking how to find $$\sum_{k=1}^n2k^2.$$ It is proposed that the question be closed as a duplicate of a much older one, asking how to find $$\sum_{k=1}^nk^2,$$ but ...
9
votes
0answers
105 views

“Math Processing Errors” in the Close as Duplicate Preview

I see plenty of "Math Processing Errors" in the close as duplicate preview:
9
votes
2answers
330 views

Handling near duplicates

What is the best way to handle near duplicates? Here are two examples of what I mean. This question asks about zero divisors in commutative rings. However, this older question asks a slightly more ...
8
votes
1answer
140 views

Exact duplicate doesn't require answer but claims one exists

This question was (rightly) closed as an exact duplicate: https://math.stackexchange.com/questions/1717381. (If I'm not mistaken, only moderators can do that.) The message at the top differs from the ...