Generalized topological spaces
Igor Zuzčák (1983)
Mathematica Slovaca
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Igor Zuzčák (1983)
Mathematica Slovaca
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Igor Zuzčák (1984)
Mathematica Slovaca
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Freek Wiedijk (2007)
Formalized Mathematics
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A formalization of the first proof from [6].
Ingo Bandlow (1992)
Acta Universitatis Carolinae. Mathematica et Physica
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