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Question

Math 6510 • Differentiable Manifolds

Fall 2002 • Question 2

Consider a compact differentiable \(m\)-manifold \(M\) without boundary and let \(N=M\times M\). Let \(\Delta \subset N\) be the diagonal. Prove that there is no compact differentiable \(m+1\)-dimensional submanifold with boundary \(B\subset N\), so that the boundary of \(B\) is \(\Delta \).

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Consider a compact differentiable \(m\)-manifold \(M\) without boundary and let
\(N=M\times M\). Let \(\Delta\subset N\) be the diagonal. Prove that there is no compact
differentiable \(m+1\)-dimensional submanifold with boundary \(B\subset N\), so that the
boundary of \(B\) is \(\Delta\).