Coates–Corti–Iritani–Tseng's quantum Lefschetz conjecture

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Let XX be a smooth proper Deligne–Mumford stack with projective coarse moduli space, and let YY be a smooth complete intersection in XX. Let ItwI^{tw} be a point on the twisted Lagrangian cone LXtw\mathcal L^{tw}_{X} of XX. Coates–Corti–Iritani–Tseng's conjecture. If the limit

lim⁡κ→0i∗Itw\lim_{\kappa\rightarrow 0}i^{*}I^{tw}

exists, then

lim⁡κ→0i∗Itw\lim_{\kappa\rightarrow 0}i^{*}I^{tw}

is a point on the Lagrangian cone LY\mathcal L_{Y} of YY. The conjecture does not require the line bundles defining the complete intersection to be semi-positive, and it is known to be false in general; a counterexample is given by Sultani (2022).

References

Primary source

Jun Wang, “Quantum Lefschetz theorem revisited”, arXiv:2305.04906 (2023).

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