Abstract
In this chapter we prove two of the most important results for covering dimension, the countable sum theorem for normal spaces and the subset theorem for perfectly normal spaces. Both results are due to Čech.
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References
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Charalambous, M.G. (2019). The Countable Sum Theorem for Covering Dimension. In: Dimension Theory. Atlantis Studies in Mathematics, vol 7. Springer, Cham. https://doi.org/10.1007/978-3-030-22232-1_3
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DOI: https://doi.org/10.1007/978-3-030-22232-1_3
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