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  • GEO Ambassador

    A map defined by one or more polynomials. Given aĀ fieldĀ K, a polynomial map is a mapĀ f:K^n->K^mĀ such that for all pointsĀ (x_1,...,x_n) in K^n,

    f(x_1,...,x_n)=(g_1(x_1,...,x_n),...,g_m(x_1,...,x_n)),

    for suitable polynomialsĀ g_1,...,g_m in K[X_1,...,X_n]. TheĀ zero setĀ ofĀ fĀ is the set of all solutions of the simultaneous equationsĀ g_1=...=g_m=0, and is an algebraic variety inĀ K^n.

    An example of polynomial map is theĀ ith coordinate mapĀ delta_i:K^n->K, defined byĀ delta_i(x_1,...,x_n)=x_iĀ for allĀ i=1,...,n. In the language ofĀ set theory, it is the projection of theĀ Cartesian productĀ K^nĀ onto theĀ ith factor.

    Polynomial maps can be defined on any nonempty subsetĀ SĀ ofĀ K^n. IfĀ SĀ is anĀ affine variety, then the set of all polynomial maps fromĀ SĀ toĀ KĀ is theĀ coordinate ringĀ K[S]Ā ofĀ S. IfĀ TĀ is anĀ affine varietyĀ ofĀ K^m, then every polynomial mapĀ f:S->TĀ induces aĀ ring homomorphismĀ F:K[T]->K[S], defined byĀ F(phi)=phi degreesf. Conversely, everyĀ ring homomorphismĀ G:K[T]->K[S]Ā determines a polynomial mapĀ g:S->T, whereĀ g=(G(delta_1),...,G(delta_m)).

    A polynomial mapĀ f:R->RĀ is a real-valued polynomial function. Its graph is the plane algebraic curve with Cartesian equationĀ y=f(x).

    and

    This looks interestingĀ to check out Ā andĀ thisĀ  hope this helps

    Field
    A field is any set of elements that satisfies the field axioms for both addition and multiplication and is a commutative division algebra. An archaic…
    • GEO Ambassador
      All I could find at the time til someone came along...cheers!
    • Student Surveyor

      Thanks Justin

      But hmmmm i really dont understand what you have said

      thanks for the download

      cheers

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