ncatlab.org
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nLab is a collaborative, wiki-style knowledge base for advanced mathematics, with in-depth entries on representation theory and finite groups. It provides formal definitions, explanations, examples, and links to related topics in areas like category theory and higher algebra.
More resources on Representation of Finite Groups
Etingof's Introduction to Representation Theory
Free PDF notes covering representations of finite groups and algebras
Representation theory of finite groups
Learn representation theory of finite groups with Prof. Richard Borcherds' comprehensive course. Explore key concepts and applications!
mathworld.wolfram.com
MathWorld is Wolfram's extensive online mathematics encyclopedia with detailed entries on topics such as representation theory and finite groups, including definitions, theorems, examples, formulas, and links to related concepts.
ocw.mit.edu
MIT OpenCourseWare (ocw.mit.edu) provides free, openly accessible MIT course materials across disciplines, including math courses that cover representation theory and related topics. It offers lecture notes, assignments, exams, and often video lectures from participating courses.