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Today this question was put on Hold as off-topic

https://mathoverflow.net/questions/186117/solutions-for-categories-for-the-working-mathematician

I wander if this is a disservice in fact. I suspect that a graduate student might benefit from such solutions while learning and this is part of research. Is not as if he's asking for solutions to Calculus homework. I'm not particularly inclined to suggest to reopen the question, just that I am not sure if we would actually be more helpful if we would leave these kinds of questions open.

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    $\begingroup$ It may be on topic for math.se, but less so for this forum. I have my doubts that research efforts can be furthered by having results delivered en masse. Furthering understanding of existing subjects, yes: taming the frontier, not so much. While MathOverflow is both about taming and understanding, the post is rather like asking for solution manual recommendations for undergraduate level subjects, not like reference requests to the literature. If the poster wants textbook/solution manual recommendations, have the poster try math.se $\endgroup$ – The Masked Avenger Nov 3 '14 at 22:05
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    $\begingroup$ I was one of the voters to close. There's all kinds of ways MO could benefit all kinds of people, but we don't pursue them all. The site has a narrow scope for a reason. Homework solutions is pretty well beyond the line. $\endgroup$ – Ryan Budney Nov 4 '14 at 0:53
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    $\begingroup$ My concern is the same as Ryan's. I don't see an intrinsic ethical difference between providing solutions to undergraduate homework and providing solutions to graduate school homework, and neither is really what MO is about. $\endgroup$ – Todd Trimble Nov 4 '14 at 1:12
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    $\begingroup$ @RyanBudney you are making a point in which I agree and another one that I disagree: one the one hand I understand that having a "narrow scope" has it purpose and I do like this on MO. On the other hand I think you missed my point with the sentence "Homework solutions". My question is generic to graduate school texts which do not characterize as "Homework" (at least in my mind). How about if the question asked for solutions to all exercises "left to the reader" in SGA-7? will this be Homework? $\endgroup$ – Reimundo Heluani Nov 4 '14 at 3:09
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    $\begingroup$ It may or may not be homework; it does not seem on topic for MO either. $\endgroup$ – The Masked Avenger Nov 4 '14 at 3:49
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    $\begingroup$ In general, I would find any kind of graduate-level mathematics question to be on-topic on MO. I don't really see that it matters what the source of the question is, as long as it is mathematically interesting and at the right level. Many of the advanced texts in my research area have some extremely difficult exercises in them, which sometimes even stump the experts, and these questions would certainly be on-topic at MO, despite their source. So I don't agree to any sweeping policy against posting exercises here. The policy should have to do only with the content and interest of the question. $\endgroup$ – Joel David Hamkins Nov 11 '14 at 16:08
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    $\begingroup$ I also would think a post on an exercise from Mac Lane's book, along with a summary of a failed attempt and a question directed toward understanding the failure and/or a key perspective, would be appropriate: it is such perspectives and understandings this site intends to promote. The question under discussion seems to request something the site does not promote, in my view: a large collection of answers to questions designed to exercise one's understanding. (Even Knuth wants you to do some thinking before, during, and after reading his exercise answers.) $\endgroup$ – The Masked Avenger Nov 12 '14 at 6:02
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    $\begingroup$ I don't see it desirable to ask for "failed attempts", unless they are mathematically interesting (in which case they are welcome for that reason alone). I have almost never found the numerous "what have you tried?" remarks that one finds on MSE to be useful or interesting, or even relevant, and it would be a pity for that practice to be adopted here. $\endgroup$ – Joel David Hamkins Nov 16 '14 at 22:38

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