A On embeddings of compact manifolds

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I have found the following entry on his blog by Terence Tao about embeddings of compact manifolds into Euclidean space (Whitney, Nash). It contains the theorems and (sketches of) proofs. Since it is rather short some of you might be interested in.
 
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hehe, I used that post a couple of days ago when I was checking an argument I was trying to use :)
Very useful indeed.
 
A triangulated manifold with n vertexes naturally embeds in the standard n- simplex in ##R^n##. But this embedding is high dimensional and not smooth.
 
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A sphere as topological manifold can be defined by gluing together the boundary of two disk. Basically one starts assigning each disk the subspace topology from ##\mathbb R^2## and then taking the quotient topology obtained by gluing their boundaries. Starting from the above definition of 2-sphere as topological manifold, shows that it is homeomorphic to the "embedded" sphere understood as subset of ##\mathbb R^3## in the subspace topology.

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