More On Local Connectedness Versus Weak Local Connectedness
Theorem
Let X be a weakly locally connected space. Then X is locally connected.
Proof
It is sufficient to show that the components of open sets is open. Let U be open in X and let C be a component of U. Let x be an element of C. Then x is an element of U so that there is a connected subspace A of X contained in U and containing a neighbourhood V of x. Since A is connected and A contains x, A must be a subset of C (the component containing x). Therefore, the neighbourhood V of x is a subset of C. Since x was arbitrary, we have shown that each x in C has a neighbourhood V contained in C. This shows that C is open relative to U. Therefore, X is locally connected.
A certain infinite union of decreasing broom spaces is an example of a space which is weakly locally connected at a particular point, but not locally connected at that point.
Read more about this topic: Locally Connected Space
Famous quotes containing the words local and/or weak:
“His farm was “grounds,” and not a farm at all;
His house among the local sheds and shanties
Rose like a factor’s at a trading station.”
—Robert Frost (1874–1963)
“The enemy is like a woman, weak in face of opposition, but correspondingly strong when not opposed. In a quarrel with a man, it is natural for a woman to lose heart and run away when he faces up to her; on the other hand, if the man begins to be afraid and to give ground, her rage, vindictiveness and fury overflow and know no limit.”
—St. Ignatius Of Loyola (1491–1556)