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Homework Help: Boundary of a torus or sphere?

  1. Nov 4, 2007 #1
    1. The problem statement, all variables and given/known data
    What is the boundary of a torus?

    What is the boundary of a sphere?

    3. The attempt at a solution
    Both 0?
  2. jcsd
  3. Nov 4, 2007 #2

    matt grime

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    Homework Helper

    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?
  4. Nov 4, 2007 #3
    It is not the null set is it?

    THe boundary must be a 1-manifold?
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