mathworld.wolfram.com
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MathWorld is Wolfram’s comprehensive online mathematics encyclopedia. It provides in-depth articles on topics like group theory and group actions, including definitions, theorems, examples, diagrams, and links to related concepts and references.
More resources on Group Actions
Stack Exchange - Abstract Algebra
Q&A on group actions with practitioner insights
Group Properties Wiki
Comprehensive wiki on group actions and examples
Abstract Algebra
Learn group actions with Prof. Benedict Gross! This abstract algebra course explores key concepts with clear explanations.
Algebra I
Learn group actions in Algebra I with this comprehensive course from James McKernan at MIT. Explore key concepts and strengthen your understanding!
ocw.mit.edu
MIT OpenCourseWare offers free, openly licensed MIT course materials—including lecture notes, assignments, exams, and video lectures—across a wide range of subjects. In mathematics, you can access courses on algebra and group theory, with notes and problem sets that cover concepts like group actions.
abstract.ups.edu
University of Puget Sound’s Abstract Algebra course notes, offering detailed explanations and examples of core topics (including group actions), with problems and exercises for practice.