Cohomological special effect conjecture for hypersurface linear systems

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Let L:=Ln,d(−∑i=1hmiPi){\mathcal{L}}:={\mathcal{L}}_{n,d}(-\sum_{i=1}^hm_iP_i) be a system of hypersurfaces in Pn\mathbb{P}^n with general multiple base points. A variety YY is an h1h^1-special effect variety for L{\mathcal{L}} when it satisfies the source's conditions, including h0(L∣Y)=0h^0({\mathcal{L}}_{|Y})=0, h0(L−Y)≠0h^0({\mathcal{L}}-Y)\ne0, and h1(L∣Y)>h2(L−Y)h^1({\mathcal{L}}_{|Y})>h^2({\mathcal{L}}-Y). A system is cohomologically special when it arises from such an h1h^1-special effect curve.

Cohomological special effect conjecture. The system L{\mathcal{L}} is special if and only if it is cohomologically special.

The conjecture extends the cohomological special-effect criterion to higher-dimensional hypersurface systems. The supplied text gives no resolution evidence.

References

Primary source

Cristiano Bocci, “Special effect varieties in higher dimension”, arXiv:math/0411295 (2005).

Additional references

2 papers in this index state this conjecture (2004). The statement above is taken from the most recent of them; the others are arXiv:math/0410527.

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