Boundary of a torus or sphere?

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pivoxa15
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Homework Statement


What is the boundary of a torus?

What is the boundary of a sphere?






The Attempt at a Solution


Both 0?
 

Discussion

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Neither of them is 0. In both cases it is a symbol that looks like 0 I suppose. Why don't you start with the defintions, since many things are clearly implied by them?
 
It is not the null set is it?

THe boundary must be a 1-manifold?
 

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