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Correction: A method for constructing examples of \(M\)-equivalent spaces. (English) Zbl 0779.54008
The author gives a correction for example 3.19 in his paper [ibid. 36, No. 2, 157-171 (1990; Zbl 0707.54007)] which has become invalid, because Lemma 3.22 (being crucial for that example) turned out to be false.

MSC:
54B15 Quotient spaces, decompositions in general topology
54G20 Counterexamples in general topology
22A05 Structure of general topological groups
54C15 Retraction
54D50 \(k\)-spaces
54D55 Sequential spaces
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[1] Graev, M.I.; Graev, M.I., Free topological groups, Izv. akad. nauk SSSR ser. mat., Amer. math. soc. transl. ser., 1, 8, 279-324, (1962), (in English) · Zbl 0103.33701
[2] Okunev, O.G., A method for constructing examples of M-equivalent spaces, Topology appl., 36, 157-171, (1990) · Zbl 0707.54007
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