<p>For Math and CS at least I don’t think there are any problems with taking major requirements at HM if you go to Pomona, as the departments share many resources. I don’t really know about Physics/Chem/Bio, but from what I’ve seen Pomona students generally don’t want to take classes at Mudd. There’s a difference between core major requirements and major electives however, and I think electives can be taken anywhere.</p>