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Solution of Ponomarev’s Problem of Condensation onto Compact Sets
Siberian Mathematical Journal ( IF 0.5 ) Pub Date : 2021-01-29 , DOI: 10.1134/s0037446621010146 A. V. Osipov , E. G. Pytkeev
中文翻译:
紧集上的Ponomarev凝聚问题的解
更新日期:2021-01-29
Siberian Mathematical Journal ( IF 0.5 ) Pub Date : 2021-01-29 , DOI: 10.1134/s0037446621010146 A. V. Osipov , E. G. Pytkeev
Assuming the Continuum Hypothesis (CH), we prove that there exists a perfectly normal compact topological space \( Z \) and a countable set \( E\subset Z \) such that \( Z\setminus E \) does not condense onto any compact set. The space \( Z \) enables us to answer in the negative (under CH) the following problem of Ponomarev: Is each perfectly normal compact set an \( a \)-space? We also prove that the product of \( a \)-spaces need not be an \( a \)-space.
中文翻译:
紧集上的Ponomarev凝聚问题的解
假设连续体假说(CH),我们证明存在一个完全正常的紧致拓扑空间 \(Z \) 和一个可数集 \(E \ subset Z \) ,使得 \(Z \ setminus E \) 不会凝聚到任何紧凑套装。空间 \(Z \) 使我们能够以负数(在CH下)回答Ponomarev的以下问题:每个完全正常紧致集是否都具有 \(a \) -空间?我们还证明 \(a \)- spaces的乘积不必是 \(a \) -space。