Geodesic
On Birational Transformations of Hilbert Schemes of an Algebraic Surface
Matematičeskie zametki, Tome 73 (2003) no. 2, pp. 281-294 Cet article a éte moissonné depuis la source Math-Net.Ru

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We give a precise description of the closure $\Gamma_f$ of the graph of the birational isomorphism $f\colon\operatorname{Hilb}^d\widetilde S\dasharrow\operatorname{Hilb}^dS$ of the Hilbert schemes of points on algebraic surfaces that corresponds to the blow-up $\sigma\colon\widetilde S\to S$ centered at a point on the smooth algebraic surface $S$. We prove that the projection $\operatorname{pr}_{\widetilde H}\colon\Gamma_f\to\widetilde H=\operatorname{Hilb}^d\widetilde S$ is the blow-up centered in the incidence subvariety $R\subset\widetilde H$ that parametrizes $d$-tuples of points in $\widetilde S$ such that at least two of these points are incident to the exceptional line of the blow-up $\sigma$; here $R$ is endowed with a scheme structure by means of a suitable sheaf of Fitting ideals. It is shown that $\Gamma_f$ is smooth only for $d\le2$, and a precise description of the decomposition of the second projection $\operatorname{pr}_H\colon\Gamma_f\to H=\operatorname{Hilb}^dS$ into a composition of two blow-ups with smooth centers in the nontrivial case $d=2$ is given. 
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     title = {On {Birational} {Transformations} of {Hilbert} {Schemes} of an {Algebraic} {Surface}},
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A. S. Tikhomirov. On Birational Transformations of Hilbert Schemes of an Algebraic Surface. Matematičeskie zametki, Tome 73 (2003) no. 2, pp. 281-294. http://geodesic.mathdoc.fr/item/MZM_2003_73_2_a12/

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