ON 2-SPHERES IN 4-MANIFOLDS.
ON 2-SPHERES IN 4-MANIFOLDS.
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关于 4 歧管中的 2 球体。
DOI:
10.1073/pnas.47.10.1651
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发表时间:
1961
影响因子:
11.1
通讯作者:
J. Milnor
中科院分区:
文献类型:
--
作者:
M. Kervaire;J. Milnor
Let M2n be a simply connected differentiable manifold, and let teCr (M2n) be a given homotopy class of maps S_o M2n. It is known that if n> 2, the classt can be represented by a differentiable imbedding f: So-M2n. This follows from a reasoning similar to the one used by H. Whitney9 to prove that every differentiable n-manifoldcan be differentiably imbedded in Euclidean 2n-space.(Compare MilnQr, 6 Lemma 6.) It is also included in a more general theorem of A. Haefliger. 3 Both arguments, however, break down for n= 2. This leads to the following question: