Freedman, Michael; Gompf, Robert; Morrison, Scott; Walker, Kevin
While topologists have had possession of possible counterexamples to the smooth 4-dimensional Poincar� conjecture (SPC4) for over 30 years, until recently no invariant has existed which could potentially distinguish these examples from the standard 4-sphere. Rasmussen�s s-invariant, a slice obstruction within the general framework of Khovanov homology, changes this state of affairs. We studied a class of knots K for which nonzero s.K/ would yield a counterexample to SPC4. Computations are...[Show more]
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