Opuscula Math. 34, no. 4 (), 777-788
http://dx.doi.org/10.7494/OpMath.2014.34.4.777
Opuscula Mathematica

# On some subclasses of the family of Darboux Baire 1 functions

Abstract. We introduce a subclass of the family of Darboux Baire 1 functions $$f:\mathbb{R}\rightarrow\mathbb{R}$$ modifying the Darboux property analogously as it was done by Z. Grande in [On a subclass of the family of Darboux functions, Colloq. Math. 17 (2009), 95-104], and replacing approximate continuity with $$\mathcal{I}$$-approximate continuity, i.e. continuity with respect to the $$\mathcal{I}$$-density topology. We prove that the family of all Darboux quasi-continuous functions from the first Baire class is a strongly porous set in the space $$\mathcal{DB}_1$$ of Darboux Baire 1 functions, equipped with the supremum metric.
Keywords: Darboux property, strong Świątkowski property, Baire property, $$\mathcal{I}$$-approximate continuity, quasi-continuity.
Mathematics Subject Classification: 26A15, 54C08.
Gertruda Ivanova, Elżbieta Wagner-Bojakowska, On some subclasses of the family of Darboux Baire 1 functions, Opuscula Math. 34, no. 4 (2014), 777-788, http://dx.doi.org/10.7494/OpMath.2014.34.4.777

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ISSN 1232−9274, e-ISSN 2300−6919, DOI http://dx.doi.org/10.7494/OpMath
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