Cartesian products and dyadic spaces
R. Engelking (1965)
Fundamenta Mathematicae
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R. Engelking (1965)
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Roman Pol, E. Puzio-Pol (1976)
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Aleksander Błaszczyk (1987)
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In this expository paper it is shown that Martin's Axiom and the negation of the Continuum Hypothesis imply that the product of ccc spaces is a ccc space. The Continuum Hypothesis is then used to construct the Laver-Gavin example of two ccc spaces whose product is not a ccc space.