Geodesic
Coherent and strong expansions of spaces coincide
Fundamenta Mathematicae, Tome 158 (1998) no. 1, pp. 69-80
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In the existing literature there are several constructions of the strong shape category of topological spaces. In the one due to Yu. T. Lisitsa and S. Mardešić [LM1-3] an essential role is played by coherent polyhedral (ANR) expansions of spaces. Such expansions always exist, because every space admits a polyhedral resolution, resolutions are strong expansions and strong expansions are always coherent. The purpose of this paper is to prove that conversely, every coherent polyhedral (ANR) expansion is a strong expansion. This result is obtained by showing that a mapping of a space into a system, which is coherently dominated by a strong expansion, is itself a strong expansion.
DOI : 10.4064/fm-158-1-69-80
Keywords: coherent expansion, coherent homotopy, inverse system, strong expansion, strong shape 
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Sibe Mardešić. Coherent and strong expansions of spaces coincide. Fundamenta Mathematicae, Tome 158 (1998) no. 1, pp. 69-80. doi: 10.4064/fm-158-1-69-80

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