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 Exotic symplectic structures on $S^3 \times \Bbb{R}$ Bull. Korean Math. Soc. 1998 Vol. 35, No. 1, 1-12 Yong Seoung Cho and Jin Yue Yoon Ewha Womans University, Ewha Womans University Abstract : We construct exotic symplectic structures on $S^{3}\times \Bbb R$ which is obtained by the symplectic sum of two smooth symplectic four-manifolds with exotic symplectic structures, each of which is diffeomorphic to $\Bbb R^4$. Keywords : symplectic four-manifolds, exotic symplectic structure, Lagrangian submanifold MSC numbers : Primary 57N13, 58F05 Downloads: Full-text PDF