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This is an important issue to get right.

The two math sites are clearly different and are aimed quite deliberately at different but overlapping populations of users, questions and answers. The same question, were it to be posted on both sites, would receive very different kinds of answers and levels of attention at the two sites. It seems to me that we should develop a guiding policy for migration to help each question find the home that is most suitable for it.

As an active user of both sites, I have often found questions on math.SE that would in my opinion receive much better attention at MO (and conversely, of course, but that is not the issue I am discussing). Interesting but technical questions are often found here at math.SE that end up with comparatively low views and slip unanswered off the main page, whereas on MO these questions may find vigorous interest and activity. Even when a question is answered here, it might have gotten more illuminating or otherwise interesting answers on MO. Although it is obvious that the math.SE user base includes numerous mathematical experts in diverse mathematical topics, nevertheless the user populations do differ in aggregate and the questions I have in mind have not found the same success here (in terms of views, attentions, answers and votes) that I expect they would find on MO. This is a pity.

(Some examples, found very quickly, might include: Forcing questions, Generic reals in forcing iterations, Preorder of forcing notions, a question on $\Delta$-system, Comparing countable models of ZFC surely others can find many more examples. I believe that each of these questions should be migrated.)

Thus, I think we should develop a guiding policy for thinking about which questions belong on which site.

To help with this, let me begin by disagreeing with Henning's assertion that migration should occur only at the request of the OP. It is important for us to retain community control over this issue, and the OP's opinion is often not the most relevant. Some users do not realize that their question is much harder than they expected, or out of modesty or anxiety or what have you, may post their questions here on math.SE, but they really should be on MO.

At the very least, we should amend Henning's suggestion to also give credence to the users who answered the question, since these users also have an interest in placing their work where it can be appreciated best.

But even more, I would say generally that we should give credence to the community views about where such a question may belong. We should encourage people to make comments suggesting a migration where it is suitable, and simply allow the voting mechanism for migration to occur as a natural process on the site.

The policy I propose is in a sense already the default policy of the site, since it is the policy that is actually implemented in the software, which allows users to vote to migrate questions. Henning's policy, in contrast, would seem to require either a software change (which seems unlikely) or else acrimonious exchanges when people vote to migrate without an OP, or with an absent OP.

Surely the boundary between the sites will evolve organically, and our ability to migrate questions will allow us to refine it. I propose that we think initially of the dividing line as something like the dividing line between undergraduate mathematics and graduate mathematics, which I take to be similar to the line between mathematics-as-interesting-subject and mathematics-as-profession.

This is an important issue to get right.

The two math sites are clearly different and are aimed quite deliberately at different but overlapping populations of users, questions and answers. The same question, were it to be posted on both sites, would receive very different kinds of answers and levels of attention at the two sites. It seems to me that we should develop a guiding policy for migration to help each question find the home that is most suitable for it.

As an active user of both sites, I have often found questions on math.SE that would in my opinion receive much better attention at MO (and conversely, of course, but that is not the issue I am discussing). Interesting but technical questions are often found here at math.SE that end up with comparatively low views and slip unanswered off the main page, whereas on MO these questions may find vigorous interest and activity. Even when a question is answered here, it might have gotten more illuminating or otherwise interesting answers on MO. Although it is obvious that the math.SE user base includes numerous mathematical experts in diverse mathematical topics, nevertheless the user populations do differ in aggregate and the questions I have in mind have not found the same success here (in terms of views, attentions, answers and votes) that I expect they would find on MO. This is a pity.

(Some examples, found very quickly, might include: Forcing questions, Generic reals in forcing iterations, Preorder of forcing notions, a question on $\Delta$-system, Comparing countable models of ZFC surely others can find many more examples. I believe that each of these questions should be migrated.)

Thus, I think we should develop a guiding policy for thinking about which questions belong on which site.

To help with this, let me begin by disagreeing with Henning's assertion that migration should occur only at the request of the OP. It is important for us to retain community control over this issue, and the OP's opinion is often not the most relevant. Some users do not realize that their question is much harder than they expected, or out of modesty or anxiety or what have you, may post their questions here on math.SE, but they really should be on MO.

At the very least, we should amend Henning's suggestion to also give credence to the users who answered the question, since these users also have an interest in placing their work where it can be appreciated best.

But even more, I would say generally that we should give credence to the community views about where such a question may belong. We should encourage people to make comments suggesting a migration where it is suitable, and simply allow the voting mechanism for migration to occur as a natural process on the site.

The policy I propose is in a sense already the default policy of the site, since it is the policy that is actually implemented in the software, which allows users to vote to migrate questions. Henning's policy, in contrast, would seem to require either a software change (which seems unlikely) or else acrimonious exchanges when people vote to migrate without an OP, or with an absent OP.

Surely the boundary between the sites will evolve organically, and our ability to migrate questions will allow us to refine it. I propose that we think initially of the dividing line as something like the dividing line between undergraduate mathematics and graduate mathematics, which I take to be similar to the line between mathematics-as-interesting-subject and mathematics-as-profession.

This is an important issue to get right.

The two math sites are clearly different and are aimed quite deliberately at different but overlapping populations of users, questions and answers. The same question, were it to be posted on both sites, would receive very different kinds of answers and levels of attention at the two sites. What we want to do with a guiding policy for migration is to help each question find the home that is most suitable for it.

As an active user of both sites, I have often found questions on math.SE that would in my opinion receive much better attention at MO (and conversely, of course, but that is not the issue I am discussing). We often see interesting but technical questions here at math.SE that end up with comparatively low views and slip unanswered off the main page, whereas on MO these questions may find vigorous interest and activity. Even when a question is answered here, it might have gotten more illuminating or otherwise interesting answers on MO. Although it is obvious that the math.SE user base includes numerous mathematical experts in diverse mathematical topics, nevertheless the user populations do differ in aggregate and the questions I have in mind have not found the same success here (in terms of views, attentions, answers and votes) that I expect they would find on MO. This is a pity.

(Some examples, found very quickly, might include: Forcing questions, Generic reals in forcing iterations, Preorder of forcing notions, a question on $\Delta$-system, Comparing countable models of ZFC surely others can find many more examples.)

Thus, what we want is to develop a guiding policy to help clarify our thinking about which questions belong on which site.

To help with this, let me begin by disagreeing with Henning's assertion that migration should occur only at the request of the OP. It is important for us to retain community control over this issue, and the OP's opinion is often not the most relevant. Some users do not realize that their question is much harder than they expected, or out of modesty or anxiety or what have you, may post their questions here on math.SE, but they really should be on MO. So at the very least, we should amend Henning's suggestion to also give credence to the users who answered the question, since these users also have an interest in placing their work where it can be appreciated best.

But even more, I would say generally that we should give credence to the community views about where such a question may belong. We should encourage people to make comments suggesting a migration where it is suitable, and simply allow the voting mechanism for migration to occur as a natural process on the site.

Surely the boundary between the sites will evolve organically, and the ability to migrate questions will allow us to refine it. I propose that we think initially of the dividing line as something like the dividing line between undergraduate mathematics and graduate mathematics, which I take to be similar to the line between mathematics-as-interesting-subject and mathematics-as-profession.

This is an important issue to get right.

The two math sites are clearly different and are aimed quite deliberately at different but overlapping populations of users, questions and answers. The same question, were it to be posted on both sites, would receive very different kinds of answers and levels of attention at the two sites. It seems to me that we should develop a guiding policy for migration to help each question find the home that is most suitable for it.

As an active user of both sites, I have often found questions on math.SE that would in my opinion receive much better attention at MO (and conversely, of course, but that is not the issue I am discussing). Interesting but technical questions are often found here at math.SE that end up with comparatively low views and slip unanswered off the main page, whereas on MO these questions may find vigorous interest and activity. Even when a question is answered here, it might have gotten more illuminating or otherwise interesting answers on MO. Although it is obvious that the math.SE user base includes numerous mathematical experts in diverse mathematical topics, nevertheless the user populations do differ in aggregate and the questions I have in mind have not found the same success here (in terms of views, attentions, answers and votes) that I expect they would find on MO. This is a pity.

(Some examples, found very quickly, might include: Forcing questions, Generic reals in forcing iterations, Preorder of forcing notions, a question on $\Delta$-system, Comparing countable models of ZFC surely others can find many more examples. I believe that each of these questions should be migrated.)

Thus, I think we should develop a guiding policy for thinking about which questions belong on which site.

To help with this, let me begin by disagreeing with Henning's assertion that migration should occur only at the request of the OP. It is important for us to retain community control over this issue, and the OP's opinion is often not the most relevant. Some users do not realize that their question is much harder than they expected, or out of modesty or anxiety or what have you, may post their questions here on math.SE, but they really should be on MO.

At the very least, we should amend Henning's suggestion to also give credence to the users who answered the question, since these users also have an interest in placing their work where it can be appreciated best.

But even more, I would say generally that we should give credence to the community views about where such a question may belong. We should encourage people to make comments suggesting a migration where it is suitable, and simply allow the voting mechanism for migration to occur as a natural process on the site.

The policy I propose is in a sense already the default policy of the site, since it is the policy that is actually implemented in the software, which allows users to vote to migrate questions. Henning's policy, in contrast, would seem to require either a software change (which seems unlikely) or else acrimonious exchanges when people vote to migrate without an OP, or with an absent OP.

Surely the boundary between the sites will evolve organically, and our ability to migrate questions will allow us to refine it. I propose that we think initially of the dividing line as something like the dividing line between undergraduate mathematics and graduate mathematics, which I take to be similar to the line between mathematics-as-interesting-subject and mathematics-as-profession.

This is an important issue to get right.

The two math sites are clearly different and are aimed quite deliberately at different but overlapping populations of users, questions and answers. The same question, were it to be posted on both sites, would receive very different kinds of answers and levels of attention at the two sites. What we want to do with a guiding policy for migration is to help each question find the home that is most suitable for it.

As an active user of both sites, I have often found questions on math.SE that would in my opinion receive much better attention at MO (and conversely, of course, but that is not the issue I am discussing). We often see interesting but technical questions here at math.SE that end up with comparatively low views and slip unanswered off the main page, whereas on MO these questions may find vigorous interest and activity. Even when a question is answered here, it might have gotten more illuminating or otherwise interesting answers on MO. Although it is obvious that the math.SE user base includes numerous mathematical experts in diverse mathematical topics, nevertheless the user populations do differ in aggregate and the questions I have in mind have not found the same success here (in terms of views, attentions, answers and votes) that I expect they would find on MO. This is a pity.

(Some examples, found very quickly, might include: Comparing countable models of ZFC, Preorder of forcing notions, a question on $\Delta$-system, Comparing countable models of ZFC surely others can find many more examples.)

Thus, what we want is to develop a guiding policy to help clarify our thinking about which questions belong on which site.

To help with this, let me begin by disagreeing with Henning's assertion that migration should occur only at the request of the OP. It is important for us to retain community control over this issue, and the OP's opinion is often not the most relevant. Some users do not realize that their question is much harder than they expected, or out of modesty or anxiety or what have you, may post their questions here on math.SE, but they really should be on MO. So at the very least, we should amend Henning's suggestion to also give credence to the users who answered the question, since these users also have an interest in placing their work where it can be appreciated best.

But even more, I would say generally that we should give credence to the community views about where such a question may belong. We should encourage people to make comments suggesting a migration where it is suitable, and simply allow the voting mechanism for migration to occur as a natural process on the site.

Surely the boundary between the sites will evolve organically, and the ability to migrate questions will allow us to refine it. I propose that we think initially of the dividing line as something like the dividing line between undergraduate mathematics and graduate mathematics, which I take to be similar to the line between mathematics-as-interesting-subject and mathematics-as-profession.

This is an important issue to get right.

The two math sites are clearly different and are aimed quite deliberately at different but overlapping populations of users, questions and answers. The same question, were it to be posted on both sites, would receive very different kinds of answers and levels of attention at the two sites. What we want to do with a guiding policy for migration is to help each question find the home that is most suitable for it.

As an active user of both sites, I have often found questions on math.SE that would in my opinion receive much better attention at MO (and conversely, of course, but that is not the issue I am discussing). We often see interesting but technical questions here at math.SE that end up with comparatively low views and slip unanswered off the main page, whereas on MO these questions may find vigorous interest and activity. Even when a question is answered here, it might have gotten more illuminating or otherwise interesting answers on MO. Although it is obvious that the math.SE user base includes numerous mathematical experts in diverse mathematical topics, nevertheless the user populations do differ in aggregate and the questions I have in mind have not found the same success here (in terms of views, attentions, answers and votes) that I expect they would find on MO. This is a pity.

(Some examples, found very quickly, might include: Forcing questions, Generic reals in forcing iterations, Preorder of forcing notions, a question on $\Delta$-system, Comparing countable models of ZFC surely others can find many more examples.)

Thus, what we want is to develop a guiding policy to help clarify our thinking about which questions belong on which site.

To help with this, let me begin by disagreeing with Henning's assertion that migration should occur only at the request of the OP. It is important for us to retain community control over this issue, and the OP's opinion is often not the most relevant. Some users do not realize that their question is much harder than they expected, or out of modesty or anxiety or what have you, may post their questions here on math.SE, but they really should be on MO. So at the very least, we should amend Henning's suggestion to also give credence to the users who answered the question, since these users also have an interest in placing their work where it can be appreciated best.

But even more, I would say generally that we should give credence to the community views about where such a question may belong. We should encourage people to make comments suggesting a migration where it is suitable, and simply allow the voting mechanism for migration to occur as a natural process on the site.

Surely the boundary between the sites will evolve organically, and the ability to migrate questions will allow us to refine it. I propose that we think initially of the dividing line as something like the dividing line between undergraduate mathematics and graduate mathematics, which I take to be similar to the line between mathematics-as-interesting-subject and mathematics-as-profession.