Pairs of compacta and trivial shape
Pairs of compacta and trivial shape
复制标题
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
期刊:
影响因子:
--
通讯作者:
S. Mardešić
中科院分区:
文献类型:
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作者:
S. Mardešić
. 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.