On codimension two subvarieties in hypersurfaces

Details On codimension two subvarieties in hypersurfaces On codimension two subvarieties in hypersurfaces

2010-05-21

arxiv.org/abs/1005.3990v1

Motives and algebraic cycles, 167-174, Fields Inst. Commun., 56, Amer. Math. Soc., Providence, RI, 2009

Mathematics

Algebraic Geometry

8 pages

Scientific paper

We show that for a smooth hypersurface $X\subset \bbP^n$ of degree at least 2, there exist arithmetically Cohen-Macaulay (ACM) codimension two subvarieties $Y\subset X$ which are not an intersection $X\cap{S}$ for a codimension two subvariety $S\subset\bbP^n$. We also show there exist $Y\subset X$ as above for which the normal bundle sequence for the inclusion $Y\subset X\subset\bbP^n$ does not split.

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