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4. Group trisections


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      Problem 4.1.

      Use the theory of group trisections to find invariants of $4$-manifold trisections.


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          Problem 4.2.

          Define a notion of group trisection for trisections with boundary.


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              Problem 4.3.

              Adapt group trisections to the setting of bridge trisections and use it to get invariants of knotted surfaces in $S^4$.


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                  Problem 4.4.

                  Accourding to a classical theorem by Wall, any two homotopoy equivalent, simply connected smooth closed $4$-manifolds $X$ and $Y$ become diffeomorphic after stabilizing by taking connected sums with some number of $S^1\times S^2$’s. What does it says about trisections of the trivial group?

                      Cite this as: AimPL: Trisections and low-dimensional topology, available at http://aimpl.org/trisections.