I feel a bit awkward, but my question is this: Someone asked questions on Mathoverflow and I gave answers. The whole thing was not very deep and I could provide rather standard examples to show whether something is true or not (I do not want to be more specific now).
I noticed on the arxiv a paper by this same person containing my answers but giving no reference to mathoverflow. What should I do in this case?
I would drop it, because there were no significant ideas in my answers, and anyone with some thinking and search in the literature could come to the same conclusion. But it is more a question about mathoverflow: it is somehow a misuse of the site. It is not about me, but about the fact that someone asked for help in this site, got this help but is not acknowledging it.
ADDED: My problem is solved now due to the helpful and cordial intervention of the moderators. Thank you for your diplomatic way.