Extension of measure-like set functions
Ján Šipoš (1983)
Časopis pro pěstování matematiky
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Ján Šipoš (1983)
Časopis pro pěstování matematiky
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Ján Šipoš (1990)
Mathematica Slovaca
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Lj. Kočinac (1991)
Matematički Vesnik
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Ian Stares (1995)
Commentationes Mathematicae Universitatis Carolinae
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We provide a characterisation of monotone normality with an analogue of the Tietze-Urysohn theorem for monotonically normal spaces as well as answer a question due to San-ou concerning the extension of Urysohn functions in monotonically normal spaces. We also extend a result of van Douwen, giving a characterisation of -spaces in terms of semi-continuous functions, as well as answer another question of San-ou concerning semi-continuous Urysohn functions.