I'm a student who majors in math. I love maths but I always felt lost in this class. She didn't explain well during the class and even sometimes confused herself when proving the theorem.
The workload is medium and the exams are fair. However, it seems that she didn't curve the score at all even if the final average is less than 50%. Even though you achieved 60+ in the final, which is much higher than the average, you still get a C or C+. Even though you got 80+ and you were in the top 3 of the class, you may only achieve B+.
Anyway, if you are confident to achieve nice scores in the final, you are OK to take this course. Only consider your own score instead of expecting her to curve.

I love Professor Greenfield. She is very helpful and patient. I didn't learn well in 131A because it was online.
And going from online and 24 hours open book exams to in-person timed closed book exams was very very challenging. But professor greenfield always explains the problems step by step and she didn't assume things I already know when I go to office hours to ask her questions. Overall, this class is very hard, but she gives a very fair final exam. As long as you try hard to understand her class notes and Homework you should be fine.

I found the material of this class to be very challenging. However, Prof Greenfeld's lectures are generally clear and you can tell she tries her best to make sure everyone understands the material. When many students (including me lol) performed poorly on the midterm, Prof Greenfeld made sure to slow down during lectures, check for student understanding more often during lectures, assign shorter homeworks, and modify the final so that at least 75% of it would be based entirely off class notes and homeworks (so basically exact problems and definitions that we had seen before). She told us of her plan for the final two or three weeks before the final, so we were given plenty of time to prepare. She also welcomes students at her office hours and has never made me feel dumb for asking dumb questions.
I personally think that Prof Greenfeld's changes after the midterm helped me a lot in her class. Still, I had to put in a lot of work for this class (attending every single lecture, spending 7-8 hours on homework each week, and attending office hours whenever I had the chance) in order to get an A. This is definitely not a class to fall behind in!

I love Professor Greenfeld very much. She is very patient and helpful during office hours and gives very engaging lectures. If you go to her office hours, you can not only learn how to solve a particular mathematical problem but also learn mathematical methods and general study advice from her, which are extremely helpful for a math major in the long run. She explains things very well in lectures and raises my greater interest in analysis. I will genuinely miss being in her class in the future.

Highly recommend taking this class with her. Fair exams and good homework problems.