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We have developed a mathematical theory of the topological vertex—a theory that
was originally proposed by M Aganagic, A Klemm, M Mariño and C Vafa on
effectively computing Gromov–Witten invariants of smooth toric Calabi–Yau
threefolds derived from duality between open string theory of smooth Calabi–Yau
threefolds and Chern–Simons theory on three-manifolds.
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