Moderator behavior is a very crucial point for a community. This means that such people have to be evaluated in a very strict manner. All the time. Otherwise they tend to derange and misuse their power.
- Moderator gives partially wrong answer and deletes the correction post.
- In the same step copies the answer in the next step and earns credit.
Why are admins allowed to delete correction-posts from users even if they gave a wrong answer? When it comes to math there is no negotiation what could be wrong or right. It should be possible to point out mistakes without getting punished.
It's about this post where "whuber" gave a partially wrong answer based on the question of OP. I replied with my post and explained why he is wrong. What followed is not a discussion. My comment simply got deleted without an answer. His post remains wrong. This is not only discouraging since I've seen many incorrect answer and now took an evening to gain some points which should allow me to comment.
The next thing is a plain copy of my answer in this post from the same person, just minutes after his deletion.
This is a very shameful and discouraging behavior. Such a moderator should be degraded or at least tainted.
Never give a person too much power for an unlimited time.