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JOURNALS // Vestnik Samarskogo Universiteta. Estestvenno-Nauchnaya Seriya // Archive

Vestnik Samarskogo Gosudarstvennogo Universiteta. Estestvenno-Nauchnaya Seriya, 2014 Issue 10(121), Pages 68–73 (Mi vsgu450)

Mathematics

Linearly ordered space whose square and higher powers cannot be condensed onto a normal space

O. I. Pavlov

Peoples’ Friendship University of Russia, Moscow, 117198, Russian Federation

Abstract: One of the central tasks in the theory of condensations is to describe topological properties that can be improved by condensation (i.e. a continuous one-to-one mapping). Most of the known counterexamples in the field deal with non-hereditary properties. We construct a countably compact linearly ordered (hence, monotonically normal, thus “very strongly” hereditarily normal) topological space whose square and higher powers cannot be condensed onto a normal space. The constructed space is necessarily pseudocompact in all the powers, which complements a known result on condensations of non-pseudocompact spaces.

Keywords: condensation, normality, linearly ordered space, pseudocompact, Cartesian product, monotonically normal, Stone–Cech compactification, Tychonoff plank.

UDC: 515.122

Received: 26.05.2014



© Steklov Math. Inst. of RAS, 2024