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BIRS Workshop Lecture Videos

Concordance of lightbulbs Miller, Maggie


I use Dave Gabai's 4D light bulb theorem to prove an analogous statement in the setting of concordance: if two spheres $R$, $R'$ in a 4-manifold $X$ are homotopic and $R$ admits a dual sphere, then $R$ and $R'$ are concordant (modulo a condition on 2-torsion in the fundamental group of $X$).

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