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MathWorld is Wolfram's comprehensive online mathematics encyclopedia with hyperlinked articles, definitions, theorems, and formulas across topics. Its Lie Groups section includes definitions, properties, examples, and related concepts with references.
More resources on Lie Groups
Lie groups I: matrix Lie groups
Lecture from Frederic Schuller's Geometric Anatomy series, rigorous introduction to Lie groups.
Differential Geometry
Explore Lie groups with MIT's Differential Geometry course by George Lusztig. Dive into advanced concepts & expand your mathematical toolkit!
Lectures on the Geometric Anatomy of Theoretical Physics (Lie Groups section)
Learn Lie groups with Frederic Schuller's "Geometric Anatomy of Theoretical Physics" lectures! Explore this essential topic in theoretical physics.
John Baez's Lie Theory Page
Free notes and resources
nLab: Lie Group
Comprehensive reference with diffs geom context
Visual Group Theory (includes Lie Groups intro)
Accessible visual intro touching on Lie Groups