Abstract
The purpose of this note is to show that there exist two Tychonoff spaces X, Y, a subset A of X and a subset B of Y such that A is weakly almost Lindelöf in X and B is weakly almost Lindelöf in Y, but A × B is not weakly almost Lindelöf in X × Y.
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The author acknowledges support from the NSFC (grant 10571081) and NSF of the Education Department of Jiangsu Province.
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Song, Y.K. On the product of relatively weakly almost Lindelöf subsets. Acta Math Hung 115, 315–318 (2007). https://doi.org/10.1007/s10474-007-5254-z
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DOI: https://doi.org/10.1007/s10474-007-5254-z