While I did not handle that flag let me still comment on this (more generally).
First, yes, the post is off-topic here, yes, in principle something like this is on-topic on SO, thus one in principle one might consider migration.
However, please keep the following in mind.
A question that is migrated and then gets put on hold afterwards is something ...
The number of migration targets available for users is restricted, mostly to avoid incorrect migrations, as such migrations are difficult to undo and also impact another community.
Moderators can migrate to any site in the network. If you want to migrate somewhere else flag for moderator attention (flag, other) and suggest it.
The exact targets available ...
While such questions may be on topic on Mathematics Educators, remember that MathEd.SE is a very young public beta site. Generally migrating questions to beta sites is at least slightly discouraged. In the words of Anna Lear:
Migrating to beta sites isn't something we encourage because beta should be all about a site figuring out its own voice rather ...
Overall there are very few migrations.
Over the last 90 days there were only 8 migrations to Cross Validated (the statistics site) and also 8 to Physics (one of them rejected). Moreover there were 2 to our own meta site.
As regards incoming migrations there were about 30 from each of MathOverflow and Physics, and about 10 from each of Cross Validated and ...
Here's a step-by-step:
Wait a sufficient number of days. (At least one week.) This is just in case someone on Math.SE can answer your question.
Flag for moderator attention. Request the moderators to move the question to MathOverflow.
At this point, one of two things may happen (though it may take a few days).
One of the Math.SE mods with some expertise ...
The question still exists on the main site, so they keep their reputation – for now that is.
The question is left as a stub, or pathway to the new site, for 30 days, after which it is automatically deleted by a weekly script.
(source: What is migration and how does it work?)
In a month or so, the question will be deleted from the main site, and then the ...
Let's at least implement this for very popular arXiv-style tags (ag.algebraic-geometry and such) — it's useful both for migration and for (admittedly rare) visitors from MO asking questions here.
On the other hand, creating synonyms for numerous small tags (like recurrences used for less than 50 questions on MO) seems (to me) to be an overkill.
I'll take this time to remind everyone of the golden rule of migrations:
Don't. Migrate. Crap.
That question would not have survived on mathematica.SE, so there's no point trying to migrate it there. (Incidentally, the question has been asked on mathematica.SE, and doesn't appear to be doing so well right now.)
Onto the other issue. Adding a migration path ...
That can certainly be frustrating, and is a risk any time you offer a bounty. I don't know what your background is, but please note that MathOverflow is intended primarily for professional mathematicians and graduate students doing cutting-edge research. A sufficiently interesting question from outside that community will sometimes get a useful answer, but ...
No and yes. Questions with open bounties cannot be closed for any reason, and this includes migration. In order for a question with a bounty to be migrated, the bounty would first have to be removed. Moderators can remove bounties (and refund the reputation in the process), but we only do this on a case-by-case basis. (See the MSO FAQ.)
User-driven migration will not be enabled until Academia.SE graduates. It's a SE policy to not enable user-driven migration to beta sites.
But moderators can migrate questions anywhere on the SE network. The tricky part is bringing the question to their attention. It is natural to flag for moderator's attention simultaneously with voting to close as off-...
The bounty was only placed somewhat recently. There might still be hope.
As you speculate I assume there are not that many users familiar with Singular on the site. I doubt that Stack Overflow would be better. They do not have a tag for it, as far as I can tell, and this likely means it will fall through the cracks (especially if it is a migration).
If you truly think the question does not fit in on math.se and would be a perfect fit for scicomp.se, you can flag about it, but this occurs infrequently enough on math.se that including it in the related sites would not be practical. There are a number of other sites which we also don't include in the related list for the same reason.
Stack Overflow will probably be added as a migration path if
we have a non-negligible number of questions migrated there, and
the users here demonstrate that they have good judgment on such migrations, i.e. don't migrate crap or questions that are off-topic there to SO.
For the time being, flagging the question for moderator attention, "other->belongs to ...
The vast majority of these questions is indeed off-topic. Their closing should continue.
However, doing this with appropriate explanation (e.g. pointing to Puzzling.SE) can become tedious. On the other hand, a migration path is not going to happen as long as Puzzling is in beta, given earlier discussion about this (as linked to by Martin Sleziak). Moreover, ...
I have keyed in the synonym mappings for most of the arXiv tags.
A few slight mismatches:
ca.analysis-and-odes points now to analysis; ODE questions will need retagging manually after migration from MO.
ra.rings-and-algebras now maps to abstract-algebra.
cv.complex-variables goes to complex-analysis.
qa.quantum-algebra becomes quantum-groups.
In the last 90 days, 73 outgoing migrations have occurred, in the following distribution (we'll skip the Meta migrations, which are 18 in number). 37 to your open migration routes, and 33 through the moderator channels.
11 to Cross Validated (3 rejected)
11 to Physics (6 rejected)
7 to Stack Overflow (1 rejected)
6 to Mathematica
6 to Math Overflow (1 ...
I don't know much about mechanics, but we can generalize what Bye_World says in a comment above to all applied math questions: deciding where to ask is a matter of weight/balance of math vs. application context.
There are fairly simple mechanics problems (the forced pendulum comes to my mind; see 
), where the mathematical difficulty/issues far ...
This is intended behaviour; the Stack Exchange software isn't able to determine which tags are appropriate for a question. It will suggest some when you're typing the question, but it will never choose one for you. The question was tagged [function] when it was migrated and the function tag doesn't exist here; we do have functions but the system isn't that ...
No, there is no such option available to users (but moderators can migrate anywhere). Migration paths to other sites are purposefully limited to a very small number of sites where the need for migration arises frequently and it is reasonable to assume that there is a sufficiently large pool of users that are familiar with the standards of that site.
If you ...
I note that your comment mentioned/linked to math.SE. From what I have gathered (here and here), the heuristic algorithm decided that it was solely about migration, and in order to cut down on "noise" opted to not to include it in the migrated question.
(Goldstern smartly made no mention of math.SE, and his comment was retained; at least until some ...