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Question in topology

  1. Dec 1, 2009 #1
    Is there any formula that gives a relation between the cardinal number of a given set and the number of the topologies that can be taken from this set?
  2. jcsd
  3. Dec 1, 2009 #2
    You might want to look at http://www.research.att.com/~njas/sequences/A000798 [Broken] for some references.
    Last edited by a moderator: May 4, 2017
  4. Dec 3, 2009 #3
    Thank you for the suggestion.
    Anyway, what I am reading is not really clear.
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