Regge theory

In algebraic geometry, the Stein factorization, introduced by Template:Harvs for the case of complex spaces, states that a proper morphism can be factorized as a composition of a finite mapping and a proper morphism with connected fibers. Roughly speaking, Stein factorization contracts the connected components of the fibers of a mapping to points.

One version for schemes states the following:Template:Harv

Let X be a scheme, S a locally noetherian scheme and $f:X\to S$ a proper morphism. Then one can write

$f=g\circ f^{\prime }$

where $g:S^{\prime }\to S$ is a finite morphism and $f^{\prime }:X\to S^{\prime }$ is a proper morphism so that $f{\text{'}}_{*}{\mathcal{𝒪}}_X={\mathcal{𝒪}}_{S^{\prime }}$.

The existence of this decomposition itself is not difficult. (see below) But, by Zariski's connectedness theorem, the last part in the above says that the fiber $f{\text{'}}^{-1}(s)$ is connected for any $s\in S$. It follows:

Corollary: For any $s\in S$, the set of connected components of the fiber $f^{-1}(s)$ is in bijection with the set of points in the fiber $g^{-1}(s)$.

Proof

Set:

$S^{\prime }=$ Spec$f_{*}{\mathcal{𝒪}}_X$

where Spec is the relative Spec. The construction gives us the natural map $g:S^{\prime }\to S$, which is finite since ${\mathcal{𝒪}}_X$ is coherent and f is proper. f factors through g and so we get $f^{\prime }:X\to S^{\prime }.$, which is proper. By construction $f{\text{'}}_{*}{\mathcal{𝒪}}_X={\mathcal{𝒪}}_{S^{\prime }}$. One then uses the theorem on formal functions to show that the last equality implies $f^{\prime }$ has connected fibers. (This part is sometimes referred to as Zariski's connectedness theorem.)

References

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro. The writing of this article benefited from [1].

• Template:Hartshorne AG
• Template:EGA
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