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Topology - Imbeddings of Manifolds Prove that every manifold is regular and hence
memorizable. Where do you use the Hausdorff condition?
Solution
Let X be a space.
X is called regular if and only if for each point x in X and U a neighbourhood of x, there is an
open set V such that
xVclVUxVclVU
Also we have that a manifold is locally Euclidean. (A topological manifold is a locally Euclidean
Hausdorff space)
In mathematics, a completely metrizable space(metrically topologically complete space) is a
topological space (X, T) for which there exists at least one metric d on Xsuch that (X, d) is a
complete metric space and d induces the topology
Thus here to prove that is it metrizable we use the Hausdorff space that distinct points have
distinct neighbourhoods.

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  • 1. Topology - Imbeddings of Manifolds Prove that every manifold is regular and hence memorizable. Where do you use the Hausdorff condition? Solution Let X be a space. X is called regular if and only if for each point x in X and U a neighbourhood of x, there is an open set V such that xVclVUxVclVU Also we have that a manifold is locally Euclidean. (A topological manifold is a locally Euclidean Hausdorff space) In mathematics, a completely metrizable space(metrically topologically complete space) is a topological space (X, T) for which there exists at least one metric d on Xsuch that (X, d) is a complete metric space and d induces the topology Thus here to prove that is it metrizable we use the Hausdorff space that distinct points have distinct neighbourhoods.