ocw.mit.edu
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MIT OpenCourseWare (OCW) provides free, openly accessible MIT course materialsâlecture notes, assignments, exams, and often video lectures. It spans numerous subjects, including mathematics and physics topics related to unitary representations, for self-paced learning.
More resources on Unitary Representations
mathworld.wolfram.com
MathWorld is a comprehensive online mathematics encyclopedia from Wolfram, offering in-depth, encyclopedia-style articles on topics across math. It includes content on unitary representations, group theory, linear algebra, and related concepts, with definitions, formulas, examples, and references.
ncatlab.org
nLab is a collaborative wiki focused on category theory, higher categories, and related areas of mathematics and physics. It provides formal definitions, expositions, and bibliographic references across topics such as category theory, topology, representation theory (including unitary representations), and quantum algebra.