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MathWorld is Wolfram’s comprehensive online mathematics encyclopedia. It provides concise, tutorial-style articles on a broad range of topics (including manifolds) with definitions, explanations, formulas, diagrams, and references.
More resources on Manifolds
Lectures on Differential Topology
Learn differential topology with Frederic Schuller's lectures! Explore manifolds and their properties in this comprehensive course.
Differential Topology
Learn differential topology and the geometry of manifolds with N J Wildberger's comprehensive course. Explore topology now!
nLab: Manifold
Comprehensive reference with category-theoretic perspective, often linked in diff geom discussions
Differential Geometry
Learn differential geometry focusing on manifolds with this course from Tobias Colding at MIT. Explore key concepts & advance your understanding!
Lectures on the Geometrical Anatomy of Theoretical Physics
Explore manifolds with Frederic Schuller's "Lectures on the Geometrical Anatomy of Theoretical Physics." A comprehensive course for physics students.
Introduction to Smooth Manifolds
Introduction to Smooth Manifolds - A book resource