ar X iv : d g - ga / 9 60 20 02 v 1 1 F eb 1 99 6 Associativity properties of the symplectic sum
نویسنده
چکیده
In this note we apply a 4-fold sum operation to develop an associativity rule for the pairwise symplectic sum. This allows us to show that certain diffeomorphic symplectic 4-manifolds made out of elliptic surfaces are in fact symplectically deformation equivalent. We also show that blow-up points can be traded from one side of a symplectic sum to another without changing the symplectic deformation class of the resulting manifold.
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