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SPARSE SETS ON THE PLANE AND DENSITY POINTS DEFINED BY FAMILIES OF SEQUENCES

Published online by Cambridge University Press:  06 March 2012

GRAŻYNA HORBACZEWSKA*
Affiliation:
Department of Mathematics and Computer Science, University of Łódz, Banacha 22, 90 238 Łódz, Poland (email: [email protected])
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Abstract

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A condition equivalent to sparseness of a set on the plane is formulated and used as a motivation for a new concept of density point on the plane. This is investigated and compared with known previous versions.

Type
Research Article
Copyright
Copyright © Australian Mathematical Publishing Association Inc. 2012

References

[1]Filipczak, T., ‘On some abstract density topologies’, Real Anal. Exchange 14 (1988–89), 140166.CrossRefGoogle Scholar
[2]Filipczak, T., ‘Monotonicity theorems for some local systems’, Real Anal. Exchange 19 (1993–94), 114120.CrossRefGoogle Scholar
[3]Filipczak, T., ‘On sparse sets and density points defined by families of sequences’, Bull. Inst. Math. Acad. Sin. (N.S.) 3(2) (2008), 339346.Google Scholar
[4]Filipczak, M. and Hejduk, J., ‘On topologies associated with the Lebesgue measure’, Tatra Mt. Publ. 28 (2004), 187197.Google Scholar
[5]Horbaczewska, G., ‘On the density type topologies in higher dimension’, Bull. Aust. Math. Soc. 83(1) (2010), 158170.CrossRefGoogle Scholar
[6]Horbaczewska, G., ‘On the comparison of the density type topologies generated by sequences on the plane’, in: Real Functions, Density Topology and Related Topics (Wydawnictwo Uniwersytetu Łódzkiego, 2011), pp. 3744.Google Scholar
[7]Sarkhel, D. N. and De, A. K., ‘The proximally continuous integrals’, J. Aust. Math. Soc. Ser. A 31 (1981), 2645.CrossRefGoogle Scholar
[8]Wagner-Bojakowska, E., ‘Topologie gestosci i I-gestosci na plaszczyznie’, Acta Universitatis Lodziensis (1985).Google Scholar
[9]Wilczyński, W., ‘Density topologies’, in: Handbook of Measure Theory (ed. Pap, E.) (North-Holland, Amsterdam, 2002), Ch. 15, pp. 675702.CrossRefGoogle Scholar