Help!!c problem in math

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    Question Help!!c problem in math

    Code:
    we call s is a topology of a set S,if s is a set of several subsets of S which satisfied: 
    1.s contains  empty set and S; 
    2.if a and b belong to s ,then the intersection of a and b also belongs to s;
    3.the unity of several sets which belong to s is also belongs to s.
    
    assume a set S = {1,2,...,n} . How many topologies of S do we have?

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    Woof, woof! zacs7's Avatar
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    Last edited by zacs7; 10-06-2007 at 03:07 AM. Reason: Spelt it's wrong... lol

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    and the hat of wrongness Salem's Avatar
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    Nothing to do with C, just a simple visit to mathworld should suffice.
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