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Keywords:
stratifiable space; $\varkappa $-metrizable space; Niemytzki plane; Sorgenfrey line
stratifiable space; $\varkappa $-metrizable space; Niemytzki plane; Sorgenfrey line
Summary:
We prove that the Niemytzki plane is $\varkappa $-metrizable and we try to explain the differences between the concepts of a stratifiable space and a $\varkappa $-metrizable space. Also, we give a characterisation of $\varkappa $-metrizable spaces which is modelled on the version described by Chigogidze.
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