Normal bundle

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Normal bundle to a submanifold, or immersed manifold: The quotient of the tangent bundle to the whole manifold (restricted to the submanifold), by the tangent bundle to the submanifold, or immersed manifold. When the manifolds are Riemannian, the normal bundle can be viewed as the orthogonal complement to the tangent bundle of the submanifold, in the tangent bundle to the whole manifold.

Vectors in the normal bundle are termed normal vectors.

Main subject wiki entry: Diffgeom:Normal bundle

Also located at: Wikipedia:Normal bundle, Mathworld:NormalBundle, Planetmath:NormalBundle