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Visual Group Theory
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Free online book with diagrams for groups
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Stack Exchange Abstract Algebra
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Abstract Algebra on Art of Problem Solving
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Introduction to Abstract Algebra
Explore algebraic structures with MIT's Intro to Abstract Algebra course by Benedict Gross! Learn group theory, rings, and fields.
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Abstract Algebra - Dummit, Foote
A comprehensive and standard reference for graduate-level algebra.
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mathworld.wolfram.com
Wolfram MathWorld is an online math encyclopedia offering detailed articles, definitions, and examples across topics, including comprehensive entries on algebraic structures like groups, rings, and fields.
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ocw.mit.edu
MIT OpenCourseWare offers free, openly accessible MIT course materials, including abstract algebra courses on algebraic structures, with lecture notes, assignments, and exams you can study at your own pace.