Introduction to Mathematical Thinking
Learn how to think the way mathematicians do – a powerful cognitive process developed over thousands of years.
It turns out that Coursera were not able to implement in time the requirement that you have to pass training to grade other students. As many of you have discovered, you are asked if you want to do so right after you complete the final training exercise, however you did. Since all aspects of this process are experimental (we are collecting the first data right now!), I'd suggest that if you feel comfortable grading, go ahead and do so. Most people who have done this find it really helps them understand the material and the nature of proof.