Lower bounds on the F-pure threshold and extremal singularities
Lower bounds on the F-pure threshold and extremal singularities
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F 纯阈值和极值奇点的下界
DOI:
10.1090/btran/106
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Witt, Emily
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文献类型:
--
作者:
Kadyrsizova, Zhibek;Kenkel, Jennifer;Page, Janet;Singh, Jyoti;Smith, Karen;Vraciu, Adela;Witt, Emily
We prove that ifis a reduced homogeneous polynomial of degree, then its-pure threshold at the unique homogeneous maximal ideal is at least. We show, furthermore, that its-pure threshold equalsif and only ifand, whereis a power of. Up to linear changes of coordinates (over a fixed algebraically closed field), we classify such “extremal singularities”, and show that there is at most one with isolated singularity. Finally, we indicate several ways in which the projective hypersurfaces defined by such forms are “extremal”, for example, in terms of the configurations of lines they can contain. References
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