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Search: id:A137814
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| A137814 |
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Smallest size (greater than 1) of a topology that cannot be made using n points. |
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2
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OFFSET
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1,1
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REFERENCES
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K. Ragnarsson and B. E. Tenner, Obtainable sizes of topologies on finite sets, preprint.
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EXAMPLE
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There is no topology on 3 points having 7 open sets. However, there do exist topologies on 3 points that have 2, 3, 4, 5, and 6 open sets.
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CROSSREFS
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Cf. A137813.
Sequence in context: A082603 A071997 A093442 this_sequence A077858 A126116 A133846
Adjacent sequences: A137811 A137812 A137813 this_sequence A137815 A137816 A137817
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KEYWORD
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nonn
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AUTHOR
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Bridget Eileen Tenner (bridget(AT)math.depaul.edu), Feb 11 2008
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