He is one of the better math professors that I have had at UCLA. His lectures are clear most of the time. I wouldn't suggest asking questions because half of the time he doesn't understand what you are asking. The other half of the time he gives a good explanation.
His homework assignments are a bit tedious and are difficult. There are many resources online to help you gain points on the homework.
The exams are much easier than the homework and are on the easier side compared to other math midterms/finals at UCLA.He doesn't ask for anything too complicated on his tests.
The lectures are a good supplement to the book. I never went to office hours, so I can't comment on how helpful he was there. He spends 1 lecture before the midterm and 2 lectures before the final reviewing. This is helpful and the example problems he gives are similar to test questions.
Not a bad class w/ this prof at all.
Grade received: A

The professor always mumbled and it's pretty obvious he didn't care about teaching or his students. He would never stay for questions and would always run out of class as soon as he finished lecturing.

I really liked this professor, has an accent that is not really hard to understand compared to the many other asian professors with horrible accents. He has the most amazing handwriting so it is really easy to read board. Homework is do-able, find the solutions online. Curve is very generous and overall he knows his material. But beware this is a proof intensive class meaning very abstract and not much computation. Getting this far means you must have some passion for math. goodluck

Welcome to upper division math.. After having friends take 115 before me, I had an idea of how difficult the class could be if you treat it like a lower division math class. I breezed through the lower division classes with not so much effort, and found myself spending long hours on the homework for this class. (try and get the solutions for the difficult proofs). Not to say you should be intimidated, I found the class intriguing, and if you've made it this far and you have some passion for math, it should be the same. Liu spends each lecture going over definitions, theorems, and proofs, a few every lecture, and an occasional example problem. The book isn't that bad, il admit it isn't fantastic, but unless you are naturally brilliant, some are, you'll need to go to class to better understand the material. The nice thing about liu is that he only has 1 midterm and a final (I guess if you screw up the midterm, not so nice.) But he is very concise, rarely makes mistakes, and makes the occasional funny joke. The breakdown was 20% homework, 30% midterm, 50% final. The final was 3 computations and 7 proofs (out of the 100 youve seen from homework and lecture), got curved to a 55/100. my unadjusted D turned out to be an A-, so like everyone else has said, Liu has an empathetic curve. I would personally recommend him, as I've heard many other teachers are not so forgiving, and any 115 class is going to be difficult. Good Luck! and it might be helpful to take 115 soon after 33A.