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<p>sets as the <a href="page.php?w=Fixed_point_%28mathematics%29">fixed points</a> of an <a href="page.php?w=Operator_%28mathematics%29">operator</a> on the <a href="page.php?w=power_set">power set</a> of </p>

<p>A <a href="page.php?w=Net_%28mathematics%29">net</a> is a generalisation of the concept of <a href="page.php?w=sequence">sequence</a>.  A topology is completely determined if for every net in  the set of its <a href="page.php?w=Topology_glossary">accumulation points</a> is specified.</p>

<p><big> Comparison of topologies </big></p>
<p>Many topologies</p><p>
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