can you double major in the same field
A double degree program, sometimes called a dual degree, combined degree, conjoint degree, joint degree, simultaneous degree or double graduation program, involves a student's working for two different university degrees in parallel, either at the same institution or at different institutions (sometimes in different countries), completing them in less time than it would take to earn them separately. The two degrees might be in the same subject area (especially when the course is split between countries), or in two different subjects.
Double degree