Disconnected (topology)/Definition

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Mendelson and Lee's topological manifolds have it covered, I think Munkres is where I got "separation" from

Definition

A topological space, (X,J), is said to be disconnected if[1]:

  • U,VJ[UVVU=UV=X], in words "if there exists a pair of disjoint and non-empty open sets, U and V, such that their union is X"

In this case, U and V are said to disconnect X[1] and are sometimes called a separation of X.

References

  1. Jump up to: 1.0 1.1 Introduction to Topological Manifolds - John M. Lee