Generic linkage preserves local complete intersection log canonical singularities

Let S=SpecRS=\operatorname{Spec} R be a regular affine scheme over kk, and let XSX\subset S be a subscheme defined by I=(z1,,zt)I=(z_1,\ldots,z_t) of codimension rr. Let M=(Uij)t×rM=(U_{ij})_{t\times r} be a matrix of variables, set R=R[Uij]R'=R[U_{ij}], define α=(α1,,αr)=(z1,,zt)M\alpha=(\alpha_1,\ldots,\alpha_r)=(z_1,\ldots,z_t)\cdot M and J=[α:IR]J=[\alpha:IR'], and set Y=SpecR/JY=\operatorname{Spec} R'/J. Generic-linkage conjecture. If XX is local complete intersection log canonical, then YY is also local complete intersection log canonical. The question is motivated by the difficulty of transferring singularities from XX to its generic link, since there is no natural morphism from the link to XX; the conjecture is presented as an open question.

Sources & referencesView supporting material

Primary source

Wenbo Niu, “A Bound for the Castelnuovo-Mumford Regularity of Log Canonical Varieties”, arXiv:0912.3311 (2011).

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