This is quite possibly the worst professor at UCLA. To start, the book he chose to teach the course was full of errors, many of which he noted himself. His lectures were just filled with formulas and derivations which he failed to explain, and his notation was inconsistent, making it difficult to follow. He was unhelpful during office hours and sometimes could not even answer the questions he assigned. His TA was extremely lazy and was never available. Don't take a class with Williams, it will ruin your quarter.