Reference
K. Kuratowski,Topology II. Academic Press, 1968.
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This work was supported by a grant from the National Sciences and Engineering Research Council of Canada.
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Bruckner, A.M., Petruska, G., Preiss, D. et al. The equationu xuy=0 factors. Acta Math Hung 57, 275–278 (1991). https://doi.org/10.1007/BF01903678
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DOI: https://doi.org/10.1007/BF01903678