Path connectedness of union of path connected spaces

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SUMMARY

The discussion centers on the path connectedness of the union of a collection of path connected subspaces {Aj} within a space X, given that their intersection is nonempty. The conclusion drawn is that the union U Aj is not necessarily path connected in general. However, the presence of a nonempty intersection implies that any two points, x from U Aj and y from the intersection, can be connected by a path, as both points belong to at least one common subspace Aj.

PREREQUISITES
  • Understanding of path connected spaces in topology
  • Familiarity with the concept of intersections of topological spaces
  • Knowledge of basic properties of unions of topological spaces
  • Basic understanding of continuous functions and paths in a topological context
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  • Explore examples of non-path connected unions of path connected spaces
  • Learn about the implications of nonempty intersections in topological spaces
  • Investigate the role of continuous functions in establishing path connectedness
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Mathematicians, particularly those specializing in topology, students studying advanced mathematics, and anyone interested in the properties of path connected spaces and their unions.

radou
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Homework Statement



As the title suggests, Let {Aj} be a collection of path connected subspaces of some space X, and let the intersection of these subspaces be nonempty. Is U Aj path connected?

The Attempt at a Solution



Again, my answer would be no, in general.

But, since their intersection is nonempty, that means that all these subspaces share at least one element in common. So, if we choose any x from U Aj, and any y from the intersection, we can find a path which connects them, since x is in Aj, for some j, and y is in Aj, too.
 

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