I took math 110b. Old russian grandpa vibes. A voice so deep and soothing he'll genuinely make you fall asleep in class. Exams were open note (no this does not make the class is easy, it's the opposite). Because of this you must be precise with your proofs and complete them very thoroughly. Partial credit is basically non-existent even if you are close to the answer. Exams are for some reason graded on myucla instead of gradescope. Besides the exams, this professor is very good at teaching and has some of the nicest handwriting I've ever seen.