Noether's problem

E29549

Noether's problem is a fundamental question in invariant theory and field theory that asks whether the fixed field of a finite group acting on a rational function field is itself a purely transcendental (rational) extension.

All labels observed (12)

How this entity was disambiguated

Statements (54)

Predicate Object
instanceOf mathematical problem
problem in field theory
problem in invariant theory
asksAbout rationality of fixed fields under finite group actions
asksWhether the fixed field of a finite group acting on a rational function field is purely transcendental
the invariant field k(x_g : g in G)^G is k-rational
dependsOn the base field k
the finite group G
field Galois theory
algebraic geometry
algebraic number theory
field theory
invariant theory
hasAnswerType yes-or-no question
hasSpecialCase Noether's problem for abelian groups
linked to: Noether's problem

Noether's problem for cyclic groups
linked to: Noether's problem

Noether's problem for dihedral groups
linked to: Noether's problem

Noether's problem for p-groups
linked to: Noether's problem

Noether's problem for symmetric groups
linked to: Noether's problem

Noether's problem over algebraically closed fields
Noether's problem over the rational numbers
linked to: Noether's problem
involves finite group actions on fields
fixed fields of group actions
rational function fields
knownResult Bogomolov used the unramified Brauer group to produce counterexamples
linked to: Noether's problem

Endo and Miyata obtained positive results for certain abelian groups
Swan constructed counterexamples over the rational numbers
Voskresenskii studied Noether's problem via algebraic tori
linked to: Noether's problem

for many finite abelian groups over algebraically closed fields of characteristic zero the answer is yes
there exist finite groups for which the answer to Noether's problem is no
motivation constructing generic polynomials for finite groups
understanding generic Galois extensions with group G
namedAfter Emmy Noether
questionForm is k(G) k-rational?
relatedConcept Bogomolov multiplier
linked to: Noether's problem

Noether field
essential dimension
generic Galois extension
generic polynomial
invariant field
purely transcendental extension
rational field extension
unramified Brauer group
versal torsor
relatedTo Noether's normalization lemma
birational geometry of quotient varieties
inverse Galois problem
rationality problem for quotient varieties
standardFormulation given a field k and a finite group G, is k(x_g : g in G)^G purely transcendental over k?
status open in full generality
timePeriod formulated in the early 20th century
typicalNotation k(G) for the fixed field k(x_g : g in G)^G
typicalSetup a base field k and a finite group G acting by k-automorphisms
a finite group G acting on a rational function field k(x_g : g in G)

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Referenced by (13)

Full triples — surface form annotated when it differs from this entity's canonical label.

Emmy Noether notableWork Noether's problem
Noether's problem relatedConcept Bogomolov multiplier
linked to: Noether's problem
Noether's problem hasSpecialCase Noether's problem for abelian groups
linked to: Noether's problem
Noether's problem hasSpecialCase Noether's problem for cyclic groups
linked to: Noether's problem
Noether's problem hasSpecialCase Noether's problem over the rational numbers
linked to: Noether's problem
Noether's problem hasSpecialCase Noether's problem for p-groups
linked to: Noether's problem
Noether's problem hasSpecialCase Noether's problem for symmetric groups
linked to: Noether's problem
Noether's problem hasSpecialCase Noether's problem for dihedral groups
linked to: Noether's problem
Noether's problem knownResult Voskresenskii studied Noether's problem via algebraic tori
linked to: Noether's problem
Noether's problem knownResult Bogomolov used the unramified Brauer group to produce counterexamples
linked to: Noether's problem
Noether field relatedTo Noether’s problem
linked to: Noether's problem
Swan constructed counterexamples over the rational numbers relatedTo Noether's problem for finite groups
linked to: Noether's problem