= Alexander's theorem
{wiki=Alexander's_theorem}
Alexander's theorem, often associated with the mathematician James Waddell Alexander II, refers to several concepts in mathematics, depending on the context. Here are a couple of notable ones: 1. **Alexander's Theorem in Topology**: This theorem relates to the concept of homeomorphisms of topological spaces. It states that every simple closed curve in the plane divides the plane into an "inside" and an "outside," forming distinct regions.
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