Publication:
A Characterization of Continuity Revisited

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Publication Date
2011-02
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Mathematical Assoc Amer
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It is well known that a function f : R -> R is continuous if and only if the image of every compact set under f is compact and the image of every connected set is connected. We show that there exist two 2(c)-dimensional linear spaces of nowhere continuous functions that (except for the zero function) transform compact sets into compact sets and connected sets into connected sets respectively.
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R. M. Aron, V. I. Gurariy, and J. B. Seoane-Sepúlveda, Lineability and spaceability of sets of functions on R , Proc. Amer. Math. Soc. 133 (2004) 795–803. oi:10.1090/S0002–9939-04–07533-1 J. L. Gámez-Merino, G. A. Mu~noz-Fernández, V. M. Sánchez, and J. B. Seoane-Sepúlveda, Sierpiński-Zygmund functions and other problems on lineability, Proc. Amer. Math. Soc. 138 (2010) 3863–3876. doi:10.1090/50002–9939-2010–10420-3 D. J. Velleman, Characterizing continuity, Amer. Math. Monthly 104 (1997) 318–322. doi:10.2307/2974580
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