Listen, he's not gonna blow your socks off. His lectures are slightly all over the place but homework is optional but needs to be completed to take exams. His grading is very lenient, which helps with learning the material. Holds office hours regularly, nice guy

My favourite professor at UCSB. I highly recommend taking his class. I took 4A and 124A with him and he was a great lecturer for both and I prefer his course format.

I could not understand anything from his lecture. Everything I learned is from TA, He made many typos in class and lecture notes. He could not explain things clearly. Lecture is totally useless.

Professor Birnir is a nice person, but maybe not a perfect instructor. He is willing to help, but his lecture is basically repeating the textbook (90% is exactly the same). The grading is very very lenient. Higher than 85 is an A. TONS of HW. Extremely difficult knowledge but tests are relatively easy, especially the final. Hard to learn something.

The course is so hard; the material is difficult to understand, and homework can take 10 hours each week if you do it on your own. Lectures are no better than directly reading the textbook. However, exams are open-book, and everything on homework and exams can be found online or in the textbook. So the difficulty really depends on how you learn.

very easy class but did not learn anything

If you survive Birnir, you'll be reforged into an immortal.

This class was super easy to take online. His lectures weren't the best but I feel like I learned enough. 4 exams but you have one week to do each one and you can ask your TA questions about it in your section. No final. Was really nice to have a low stress class for once.

Take him if you want an easy A. But don't take him if you want to learn the concepts. The lectures are very confusing and not well organized, and I highly recommend using the textbook he recommended to help your understanding. The exams are VERY EASY. Just make sure you fully get the concepts for future math courses.

By week 5 I stopped watching his lectures; YouTube taught me better. But there were many helpful TAs, and his exams were really easy/straightforward, which completely made up for his confusing lectures. He's also really understanding about extending Webwork deadlines. If Math4A is the last math class you need, take him bc it'll be pretty easy!

He's so nice and understanding, and exams are so straightforward. Amazing professor. TAKE HIM!!

One of the most disorganized classes I've ever taken. Half of what the homework is on is never even mentioned in lecture, and what he talks about he does so in such a confusing way that it's not even worth watching the lecture. Plus he spends most of each lecture trying to figure out where he went wrong in the problem. Be ready to teach yourself