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We give an explicit formula for the difference between the standard and reduced
genus-one Gromov–Witten invariants. Combined with previous work on geometric
properties of the latter, this paper makes it possible to compute the standard
genus-one GW-invariants of complete intersections. In particular, we obtain a closed
formula for the genus-one GW-invariants of a Calabi–Yau projective hypersurface
and verify a recent mirror symmetry prediction for a sextic fourfold as a special
case.
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