My guess is they wanted you to pay the higher CS tuition to take the CS classes.
Math departments also tend to be a lot more lax in my experience. Case in point: I got sign-off to take a 300-level pure math class without its 300-level prereq. As well as just replace one required course for another to graduate.
Math departments also tend to be a lot more lax in my experience. Case in point: I got sign-off to take a 300-level pure math class without its 300-level prereq. As well as just replace one required course for another to graduate.