I was surprised to see this question was closed but probably the reason is my background. I think it would be a very nice question at Mathematics Stack Exchange. Is there some way I could suggest that it be migrated?
The question you link is too old to be migrated, even from moderators. Otherwise, you could flag it for moderation attention, and explain what you want to suggest about the migration. Consider that moderators could not migrate it, though; first, they generally ask to the moderators of the other site, and if they don't want it, it doesn't get migrated.