Hello everyone, I'm a doctoral student of particle physics in ETH Zurich, and have a question in fundamental QM. I remember a friend telling me that the professor that taught him Quantum Mechanics in ETH Zurich did not believe in the Copenhagen interpretation, and thus taught the class Quantum Mechanics in a way that my friend didn't understand. Trying to roughly recall what my friend told me, he said that the professor relied a lot on groups theory and complex mathematics, that's what I recall from his description. So my question is: is that even possible? Through the course of my study of physics I have not seen any interpretation that worked other than the Copenhagen interpretation. Are there other kinds of interpretations that work but people ignore? Thank you for any efforts.