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Zev Chonoles
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When does the conormal bundle sequence split?

Let $X\subset \mathbb{P}^n$ be a smooth projective variety with ideal sheaf $I_X$. The conormal sequence is given by

$$ 0\to I\_X/I\_X^2\to \Omega\_{\mathbb{P}^n}|\_X\to \Omega\_{X}\to 0. $$ For which varieties $X$ is the sequence above split?

If I'm not mistaken, if $X$ a hypersurface, the sequence is split if and only if $X$ has degree 1.

J.C. Ottem
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