# 2-sided

In mathematics, specifically in topology of manifolds, a compact codimension-one submanifold of a manifold is said to be 2-sided in when there is an embedding with for each and . In other words, if its normal bundle is trivial. This means, for example that a curve in a surface is 2-sided if it has a tubular neighborhood which is a cartesian product of the curve times an interval. A submanifold which is not 2-sided is called 1-sided. (Wikipedia).

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## Related pages

Manifold | Fundamental group | Normal bundle | Orientation character | Submanifold | Tubular neighborhood | Torus | Real projective plane | Topology | Embedding | Codimension | MΓΆbius strip | Connected sum