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BIRS Workshop Lecture Videos

1/2 - \(\pi_1\)-null surgery kernels are universal Krushkal, Slava


it has been known for a long time that \(\p_1\)-null kernels imply surgery  ( pg 94 Freedman-Quinn book) and also that weaker grope based kernels are "universal" for surgery ( if you can solve these problems, you can solve all unobstructed surgery problems.) Slava and I have shown that a kind of kernel "half way between" the two is still universal.

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