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edited Apr 29, 2011 at 12:25

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Applications Elegant proof that any closed, oriented 3-manifold is the boundary of (co)bordism theorysome oriented 4-manifold?

at.algebraic-topology dg.differential-geometry cobordism gt.geometric-topology

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asked Apr 29, 2011 at 3:13

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Applications of (co)bordism theory

I'm looking for an elegant proof that any closed, oriented $3$-manifold $M$ is the boundary of some oriented $4$-manifold $B$.

at.algebraic-topology dg.differential-geometry cobordism