Pairs of compacta and trivial shape

Pairs of compacta and trivial shape
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对紧凑和琐碎的形状

DOI:
10.1090/s0002-9947-1974-0341387-7
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发表时间:
1974
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通讯作者:
S. Mardešić
S. Mardešić
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文献类型:
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作者:
S. Mardešić

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.设(X,Y,A),(X ',Y,A')是紧Hausdorff空间的三元组.利用ANR系统证明了:sh Y = sh r”= 0,sh(*,Y)n· sh(Y ',Y')和sh. 4 = s\iA'隐含sh(Y,Y,A)= sh(X',Y ',A').所有关于分解空间的形状和FAR的加法性质的结果,都是由K。Borsuk和T.A.查普曼,从这个定理很容易得出。特别地,sh X = sh X' = 0和sh A = sh A'意味着sh(X,A)= sh(X ',A'),鉴于Borsuk的例子,这表明对于紧凑度量对,ANR系统的形状方法不同于Borsuk方法。
. Let (X, Y, A), (X', Y, A') be triples of compact Hausdorff spaces. Using ANR-systems the following is proved: sh Y = sh r" = 0, sh(*, Y) «• sh(Y', Y') and sh.4 = s\iA' imply sh(Y, Y,A) = sh(X',Y',A'). All results concerning the shape of decomposition spaces and addition properties of FAR's, due to K. Borsuk and T.A. Chapman, follow readily from this theorem. In particular, sh X = sh X' = 0 and sh A = sh A' imply sh(X,A) = sh(X',A'), which in view of an example of Borsuk shows that for compact metric pairs the ANR-system approach to shapes differs from the Borsuk approach.