Jingrun Chen is great. His explanations in class are very clear, and just in case you miss something, he posts great lecture notes online. His exams are clear and straightforward. There's homework every week: Know how to do the homework, and the midtermfinal will be a breeze.

He is such an easy professor, cheat sheets and all, go to class and he'll give out extra hints but otherwise he will post all the lecture notes online. Take him whenever you have the chance, a truly refreshing professor

Chen is an amazing professor. Not only is he extremely intelligent, he is a kind person. He is very quick to reply to emails, and always available to help outside of class. Take him for any class that you can, even if it is not a requirement.

Posts lecture notes online so attendance is not mandatory. Just know how to do WebWork and you will be good for the midterm and the final.

Good math teacher. Has great notes posted online even though he is hard to understand in lectures. Midterm was very easy, but finals was definitely way harder. Put time into the class, and it should be easy.

Barely speaks English, the TAs do the hw in section, no help at all. Everyone needed to teach themselves, final is impossible.