Positive tangent-bundle Seshadri constants characterize projective space

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Let XX be a smooth projective variety of dimension nn over an algebraically closed field, and let x0∈Xx_0\in X. Write ε⁡(TX;x0)\operatorname{\varepsilon}(TX;x_0) for the Seshadri constant of the tangent bundle at x0x_0. Positive tangent-bundle Seshadri constant conjecture. If there exists x0∈Xx_0\in X such that

ε⁡(TX;x0)>0,\operatorname{\varepsilon}(TX;x_0)>0,

then

X≃Pn.X\simeq\mathbb{P}^n.

This is proposed as an extension of the result proved for Fano varieties and for general points in characteristic zero; the unrestricted statement remains open.

References

Primary source

Mihai Fulger and Takumi Murayama, “Seshadri constants for vector bundles”, arXiv:1903.00610 (2019).

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