I'm watching them now, and they are simply superb, probably the best math class I've ever "taken". I particularly liked his "4 ways of matrix multiplication" (l

I'm watching them now, and they are simply superb, probably the best math class I've ever "taken". I particularly liked his "4 ways of matrix multiplication" (lecture 3) and explanation of fourier series (lecture 24), but his exposition of every concept from determinants to eigenvalues has been intuitive and memorable.