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Homework Help: Prove: If (X; T1) and (Y; T2) are homeomorphic topological

  1. Apr 22, 2012 #1
    Hi,

    Prove: If (X; T1) and (Y; T2) are homeomorphism topological spaces
    and (X; T1) is disconnected then (Y; T2) is disconnected.

    I think I need some help with this proof
    Proof:
    Let (X, T1) be disconnected and let f be a homeomorphism. If f(X,T1) is disconnected then there exist two non-empty disjoint sets A and B whose union is f(X,T1). As f^(-1) is continuous, f^(-1) A and f^(-1)B are open. As f^(-1) is a bijection, they are disjoint sets whose union is (X,T1). Therefore, (Y,T2) IS disconnected.

    thanks
     
  2. jcsd
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