Alliinase

In algebraic geometry, a morphism $f:X\to Y$ between schemes is said to be quasi-compact if Y can be covered by open affine subschemes $V_i$ such that the pre-images $f^{-1}(V_i)$ are quasi-compact (as topological space). If f is quasi-compact, then the pre-image of a quasi-compact open subscheme (e.g., open affine subscheme) under f is quasi-compact.

It is not enough that Y admits a covering by quasi-compact open subschemes whose pre-images are quasi-compact. To give an example, let A be a ring that does not satisfy the ascending chain conditions on radical ideals, and put $X=\mathrm{Spec}A$. X contains an open subset U that is not quasi-compact. Let Y be the scheme obtained by gluing two X's along U. X, Y are both quasi-compact. If $f:X\to Y$ is the inclusion of one of the copies of X, then the pre-image of the other X, open affine in Y, is U, not quasi-compact. Hence, f is not quasi-compact.

A morphism from a quasi-compact scheme to an affine scheme is quasi-compact.

Let $f:X\to Y$ be a quasi-compact morphism between schemes. Then $f(X)$ is closed if and only if it is stable under specialization.

The composition of quasi-compact morphisms is quasi-compact. The base change of a quasi-compact morphism is quasi-compact.

An affine scheme is quasi-compact. In fact, a scheme is quasi-compact if and only if it is a finite union of open affine subschemes. Serre’s criterion gives a necessary and sufficient condition for a quasi-compact scheme to be affine.

A quasi-compact scheme has at least one closed point.Template:Fact

See also

• fpqc morphism

External links

• http://mathoverflow.net/questions/34620/when-is-an-irreducible-scheme-quasi-compact

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.

• Hartshorne, Algebraic Geometry.
• Angelo Vistoli, "Notes on Grothendieck topologies, fibered categories and descent theory." Template:Arxiv

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