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arxiv: 1005.3990 · v1 · submitted 2010-05-21 · 🧮 math.AG

On codimension two subvarieties in hypersurfaces

classification 🧮 math.AG
keywords subsetcodimensionexistsubvarietiesthereabovearithmeticallybundle
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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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