Light bulbs, barbells and diffeomorphisms of 4-manifolds
Light bulbs, barbells and diffeomorphisms of 4-manifolds
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David Gabai, Princeton University
Fine Hall Common Room
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We describe the 4-dimensional light bulb theorem and show how it is a prelude towards constructing diffeomorphisms of 4-manifolds and knotted 3-balls in the 4-sphere through the use of barbell implantation. The latter is joint work with Ryan Budney.