Whitney's Immersion Theorem states that any smooth manifold can be immersed in a Euclidean space of sufficiently high dimension. This means that for a manifold of dimension n, there exists an embedding into a space of dimension 2n, allowing for the representation of the manifold without self-intersections. The theorem is significant because it provides a way to understand the behavior of smooth manifolds in higher dimensions and has profound implications in topology and geometry.
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