In differential geometry, the **normal bundle** is a specific construction associated with an embedded submanifold of a differentiable manifold. It provides a way to understand how the submanifold sits inside the ambient manifold by considering directions that are orthogonal (normal) to the submanifold. ### Definition Let \( M \) be a smooth manifold, and let \( N \subset M \) be a smooth embedded submanifold.
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