I occasionally come across questions (such as this one: Prove that the $\sigma$ - algebras are equal) in which the person asking the question has already answered their question and wants to know whether their approach is right. There are two possibilities:
- Their approach is wrong. Then you can answer the question by pointing out where they went wrong and explaining the correct approach. If they really don't understand the subject, this can be quite difficult.
- Their approach is more or less right.
Has anyone got any good ideas for how to answer the question when the person asking it has got the question right and is using the right approach? Just saying 'Yes, your approach is right' is probably fine, but it doesn't fit in very well with the other questions on the site.