> This would be like a student pointing out that the teacher incorrectly graded his paper; and after acknowledging that fact, the teacher maintains the same gra

> This would be like a student pointing out that the teacher incorrectly graded his paper; and after acknowledging that fact, the teacher maintains the same grade. Way back when I was a university undergrad, I got a 0 for a proof on a statistics exam, but the proof was correct. When I showed this to the professor, she agreed, but said it wasn't the proof she was "looking for", and so the 0 stayed. Maybe she's working for S&P now.