Detail publikace

# At most 4 topologies can arise from iterating the de Groot dual

KOVÁR, M.

Originální název

At most 4 topologies can arise from iterating the de Groot dual

Anglický název

At most 4 topologies can arise from iterating the de Groot dual

Jazyk

en

Originální abstrakt

Problem 540 of J. D. Lawson and M. Mislove in Open Problems in Topology asks whether the process of taking duals terminate after finitely many steps with topologies that are duals of each other. The problem for $T_1$ spaces was already solved by G. E. Strecker in 1966. For certain topologies on hyperspaces (which are not necessarily $T_1$), the main question was in the positive answered by Bruce S. Burdick and his solution was presented on The First Turkish International Conference on Topology in Istanbul in 2000. In this paper we show that for any topological space $(X,\tau)$ it follows $\tau^{dd}=\tau^{dddd}$. Further, we classify topological spaces with respect to the number of generated topologies by the process of taking duals.

Anglický abstrakt

Problem 540 of J. D. Lawson and M. Mislove in Open Problems in Topology asks whether the process of taking duals terminate after finitely many steps with topologies that are duals of each other. The problem for $T_1$ spaces was already solved by G. E. Strecker in 1966. For certain topologies on hyperspaces (which are not necessarily $T_1$), the main question was in the positive answered by Bruce S. Burdick and his solution was presented on The First Turkish International Conference on Topology in Istanbul in 2000. In this paper we show that for any topological space $(X,\tau)$ it follows $\tau^{dd}=\tau^{dddd}$. Further, we classify topological spaces with respect to the number of generated topologies by the process of taking duals.

Dokumenty

BibTex


@article{BUT41534,
author="Martin {Kovár}",
title="At most 4 topologies can arise from iterating the de Groot dual",
annote="Problem 540  of  J. D. Lawson and M. Mislove  in Open Problems  in
Topology asks whether the process of taking  duals  terminate after finitely many steps with
topologies that are duals of each other. The problem for $T_1$ spaces was already
solved  by  G.  E. Strecker in 1966. For certain topologies on hyperspaces
(which are not necessarily $T_1$),  the main question  was in the positive answered by Bruce S.  Burdick
and his solution  was presented on The First Turkish  International Conference on Topology  in Istanbul in 2000.
In this paper we show that for any  topological space  $(X,\tau)$ it follows
$\tau^{dd}=\tau^{dddd}$. Further, we classify topological spaces with respect to
the number of generated topologies by the process of taking duals.
",
chapter="41534",
journal="Topology and its Applications",
number="130",
volume="2003",
year="2003",
month="may",
pages="175--182",
type="journal article - other"
}