Hille–Perling's standard augmentation conjecture for strong exceptional collections

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Let XX be a rational surface. A standard augmentation is a toric system obtained from a toric system on a Hirzebruch surface by successive blow-ups and the corresponding augmentation operations. Two line bundles are completely orthogonal when the relevant Ext groups vanish in both directions; a permutation of a collection means reordering within such mutually orthogonal blocks. Hille–Perling's conjecture. Every full strong exceptional collection of line bundles on XX corresponds, up to permutation of completely orthogonal bundles, to a standard augmentation. A positive answer would describe all full exceptional collections of line bundles on rational surfaces, but the supplied text does not establish the conjecture.

References

Primary source

Alexey Elagin, Junyan Xu and Shizhuo Zhang, “On cyclic strong exceptional collections of line bundles on surfaces”, arXiv:2007.02140 (2020).

Additional references

2 papers in this index state this conjecture (2017–2020). The statement above is taken from the most recent of them; the others are arXiv:1710.03972.

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