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Manifold Definition & Meaning - Merriam-Webster
Manifold - Wikipedia
MANIFOLD | English meaning - Cambridge Dictionary
Manifold -- from Wolfram MathWorld
MANIFOLD | definition in the Cambridge English Dictionary
MANIFOLD Definition & Meaning - Dictionary.com
Manifolds 1 | Introduction and Topology - YouTube
What is a manifold? - YouTube
Manifold | Differential Geometry, Topology & Algebra | Britannica