Updated lecture notes.
Updated lecture notes.


Former-commit-id: 864547e06be76a017e999d31c725e58ff664f478 [formerly d1b56fb7adf86284676107544af0068194c156e3]
Former-commit-id: 9446eb5947840509f8c86c0eddfab7922612f40a
justinbois/bebi103_utils