Mathematics – General Topology
Scientific paper
2004-04-20
Mathematics
General Topology
Scientific paper
Suppose that a topological space $X$ is the union of an increasing sequence
of open subsets each of which is homeomorphic to the Euclidean space $R^n$.
Then $X$ itself is homeomorphic to $R^n$. This is an old theorem of Morton
Brown. We observe that this theorem is an immediate consequence of other two
theorems of Morton Brown concerning near homeomorphisms and cellular sets.
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