deep diving into representation theory for quantum mechanics. Interesting post by woit: "Quantum Theory is Representation Theory" https://www.math.columbia.edu/~woit/wordpress/?p=7108
this book by Peter Woit looks like an amazing resource on this https://www.math.columbia.edu/~woit/QMbook/qmbook-latest.pdf
physicists initially found Weyl's introduction of representation theory annoying. They called it the "Gruppenpest": the group theory plague. Sounds about right.
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