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# Hilbert’s irreducibility theorem

In this entry, $K$ is a field of characteristic zero and $V$ is an irreducible algebraic variety over $K$.

###### Definition 1.

A variety $V$ satisfies the Hilbert property over $K$ if $V(K)$ is not a thin algebraic set.

###### Definition 2.

A field $K$ is said to be Hilbertian if there exists an irreducible variety $V/K$ of $\dim V\geq 1$ which has the Hilbert property.

###### Theorem (Hilbert’s irreducibility theorem).

A number field $K$ is Hilbertian. In particular, for every $n$, the affine space $\mathbb{A}^{n}(K)$ has the Hilbert property over $K$.

However, the field of real numbers $\mathbb{R}$ and the field of $p$-adic rationals $\mathbb{Q}_{p}$ are not Hilbertian.

# References

- 1 J.-P. Serre, Topics in Galois Theory, Research Notes in Mathematics, Jones and Barlett Publishers, London.

Defines:

Hilbert property, Hilbertian field

Synonym:

Hilbertian

Major Section:

Reference

Type of Math Object:

Theorem

Parent:

## Mathematics Subject Classification

12E25*no label found*

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new question: Lorenz system by David Bankom

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new correction: examples and OEIS sequences by fizzie

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new correction: Define Galois correspondence by porton

Oct 7

new correction: Closure properties on languages: DCFL not closed under reversal by babou

new correction: DCFLs are not closed under reversal by petey

Oct 2

new correction: Many corrections by Smarandache

Sep 28

new question: how to contest an entry? by zorba

new question: simple question by parag