nLab: Lie Algebra
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The nLab's reference entry on Lie algebras, written from a category-theoretic viewpoint. It covers definitions, the link to Lie groups, Chevalley–Eilenberg algebras, L-infinity generalizations and representations, helping readers connect classical Lie theory to higher algebra and homotopy theory.
More resources on Lie Algebras
Wolfram MathWorld
MathWorld is an online mathematics encyclopedia from Wolfram Research offering detailed, browsable articles on topics across the math spectrum, including algebra, geometry, calculus, and number theory. Each entry includes definitions, theorems, formulas, diagrams, worked examples, and links to further reading.
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Learn Lie algebras from Professor Richard Borcherds! This course covers fundamental concepts and examples.
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Lie Algebras in Particle Physics
A physicist's introduction to Lie groups and Lie algebras, built around SU(2), SU(3) and the unified gauge groups. Readers learn roots, weights, Young tableaux and tensor methods well enough to classify particle multiplets and analyse symmetry in particle physics.
nLab
Collaborative wiki for mathematics, physics and philosophy written from a category-theoretic viewpoint, with cross-linked entries on categories, functors, adjunctions, topos theory, higher category theory and homotopy theory. Readers can look up precise definitions, examples and references for advanced structural mathematics.