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math.SG2004
The symplectic topology of Ramanujam's surface
Paul Seidel, Ivan Smith
Ramanujam's surface M is a contractible affine algebraic surface which is not homeomorphic to the affine plane. For any m>1 the product M^m is diffeomorphic to Euclidean space R^{4…
math.SG2004
A link invariant from the symplectic geometry of nilpotent slices
Paul Seidel, Ivan Smith
Using the symplectic geometry of certain manifolds which appear naturally in Lie theory, we define an invariant which assigns a graded abelian group to an oriented link. The releva…