MHB Cantor ternary set, construction

Dustinsfl
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Explain why all the end points of the closed intervals that comprise $C_n$ are in the Cantor set $C_n$.

I understand why this is true but I don't know how to explain it.
 
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dwsmith said:
Explain why all the end points of the closed intervals that comprise $C_n$ are in the Cantor set $C_n$.

I understand why this is true but I don't know how to explain it.

Because at each step the open middle third of each remaining intervals is removed, which always leaves the end points of the intervals at the earlier stage in the set, and as end points of the new intervals (one of the end points the other for each interval is created at each step).

CB
 
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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