Geodesic
Monotone normality and extension of functions
Commentationes Mathematicae Universitatis Carolinae, Tome 36 (1995) no. 3, pp. 563-578.

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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 $K_0$-spaces in terms of semi-continuous functions, as well as answer another question of San-ou concerning semi-continuous Urysohn functions.
Classification : 54C20, 54D15, 54E50
Keywords: monotonically normal; extension of functions; Tietze; Urysohn; $K_1$; $K_0$ 
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Stares, I. S. Monotone normality and extension of functions. Commentationes Mathematicae Universitatis Carolinae, Tome 36 (1995) no. 3, pp. 563-578. http://geodesic.mathdoc.fr/item/CMUC_1995__36_3_a17/