Английская Википедия:Invariant polynomial

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In mathematics, an invariant polynomial is a polynomial <math>P</math> that is invariant under a group <math>\Gamma</math> acting on a vector space <math>V</math>. Therefore, <math>P</math> is a <math>\Gamma</math>-invariant polynomial if

<math>P(\gamma x) = P(x)</math>

for all <math>\gamma \in \Gamma</math> and <math>x \in V</math>.[1]

Cases of particular importance are for Γ a finite group (in the theory of Molien series, in particular), a compact group, a Lie group or algebraic group. For a basis-independent definition of 'polynomial' nothing is lost by referring to the symmetric powers of the given linear representation of Γ.[2]

References

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Шаблон:PlanetMath attribution


Шаблон:Commutative-algebra-stub