Awesome series! However, starting at 31:00 he's using loose language and is not very precise with notation (or I am missing something). IMHO, it is not correct to write Y=g(X). Moreover, below that he is also writing g(x) (lower case "x"). I think the correct ought to be Y=g o X (where "o" is function composition). Only then does g(x) (lowercase "x") make sense. Otherwise if what he is writing "Y=g(X)" is the correct form, what is the domain of g?####[['series', 'Course_General_Feedback', 'POS'], ['NULL', 'Instructor', 'NEG']]