I found Prof. May to be a dedicated instructor. Math 115A is traditionally the class where undergrads learn how to write formal mathematical proofs, and Prof. May took that responsibility seriously. For the first few weeks' lectures, she wrote out all proofs formally, just to get us used to the style of proofs that we need to write ourselves. She also covered some other background not traditionally presented in 115A, such as fields and finite fields, which helped solidify my understanding.

Even though I'm not a math major, the things I learned in this class seriously helped with a lot of other proof-based classes I took afterwards. I highly recommend Prof. May's Math 115A.