Talk:Cobordism

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Geometry guy 15:19, 22 May 2007 (UTC)

[edit] compactness

It should be supposed that the three manifolds M,N and W are compact ! Otherwise, any manifold M would be cobordant to the empty manifold via W:=Mx[0,1[, which would not be very interesting... —Preceding unsigned comment added by 162.38.126.112 (talk) 16:06, 6 March 2008 (UTC)