I will preface by saying he is a VERY clear lecturer, genuinely the only lectures I have ever been to that I felt I understood in real time.

BUT: The exams were disproportionately difficult compared to the homework and the examples given in class. The first exam was incredibly difficult, the average was around 50-60%, and no one got a 100%. He even told us MOST of the class left a question at the end fully blank. The second exam was easier in terms of the problems, but IT WAS SIX (AS IN 1 2 3 4 5 6) MULTIPART (A, B, C , D, AND EVEN E SOMETIMES), LONG QUESTIONS IN 50 MINUTES, WITH INCREDIBLY LONG AND TEDIOUS ARITHMETIC. NOT A SINGLE PERSON FINISHED IN TIME.

This class genuinely gave me trust issues when it comes to exams. Ended up dropping it week 9. 32A is easy in terms of content, but this professor wanted to lower his average and made the exams insanely difficult and borderline unfair. It felt impossible to succeed in this class, and I felt the professor was aware of that, but did nothing to help anyone succeed.

Overall I liked 31B taught by Professor Li but I wouldn't say this is an easy class.
Good things about this class:
1. The professor is very helpful, he replies to your emails in a timely manner and is often willing to stay after class to answer your questions.
2. Workload is manageable, he gives less work during Thanksgiving break/midterm week.
3. Professor Li is genuinely a nice and chill person.
But there were things that went not so well:
1. Classes are not recorded or broadcasted.
2. Midterms were hard but the Professor was generous with partial credit.
3. The professor's teaching could've been clearer.

goat professor. easiest final ever. notes are extremely organized and closely follow the textbook. allows cheat sheet on exams. he explicitly states that he will make the next exam easier if the previous one was too hard. he has an accent but imo manageable

Just take him. Super chill guy and usually pretty funny, especially for such a large lecture. Notes are available and he records lectures. Sometimes, his accent is hard to understand, but he is very accommodating and hosts so many office hours. He's also really available by email where he is very clear.

The math department screwed his class over by limiting the number of As he gives out, but his tests are very clear and not surprising at all, as they come with practice examples, he gives partial credit and he allows for regrade requests. Most of the questions pretty closely resemble the examples he does in class.

There's very little wasted time in class because it's fast-paced, but it's not boring. Homework was slightly more difficult, but not impossible, and each assignment was worth 10 points. 8 of those points would be for completion, and 2 would come from a random problem the TAs would grade.

Grading breakdown: 20% homework, 25% midterm 1, 25% midterm 2, 30% final OR 20% homework, 35% best of your midterms, 45% final, whichever is higher.