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On the Camacho-Lins Neto regularity. (arXiv:1706.07508v1 [math.AG])
来源于:arXiv
We work with codimension one foliations in the projective space
$\mathbb{P}^{n}$, given a differential one form $\omega\in
H^0(\mathbb{P}^n,\Omega^1_{\mathbb{P}^n}(e))$, such differential form verifies
the Frobenius integrability condition $\omega\wedge d\omega =0$.
In this work we show that the Camacho-Lins Neto regularity, applied for
$\omega$, is equivalent to the fact that every first order unfolding of
$\omega$ is trivial up to isomorphism. We do this by computing the
Castelnuovo-Mumford regularity of the ideal $I(\omega)$ of first order
unfoldings. With this result, we are also showing that the only regular
projective foliations, with reduced singular locus, are the ones that have
singular locus only Kupka type singularities.
At last we use these results to show that every foliation $\varpi\in
\Omega^1_{\mathbb{C}^{n+1}}$, with initial form $\omega$ regular and
dicritical, is isomorphic to $\omega$. 查看全文>>