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disc theorem
In the area of mathematics known as differential topology, the disc theorem of states that two embeddings of a closed ''k''-disc into a connected ''n''-manifold are ambient isotopic provided that if ''k'' = ''n'' the two embeddings are equioriented.
The disc theorem implies that the connected sum of smooth oriented manifolds is well defined.
==References==
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抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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