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2-sided
In topology, 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. ==Examples==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「2-sided」の詳細全文を読む
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