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NAGtypes :: generalEquations

generalEquations -- random linear combinations of equations/generators

Synopsis

Description

A variety V (that is not necessarily a complete intersection) of codimension k is a component of a complete intersection of codimension k defined by k general linear combinations of any generating set of the defining ideal of V.

This function automates the above construction.

i1 : R = CC[x,y,z];
i2 : F = {x*y, x^2 - y, x*z};
i3 : L = generalEquations(2,F)

                            2                                           
o3 = {(.60002 + .468437*ii)x  + (.0254988 + .451115*ii)x*y + (.0817482 +
     ------------------------------------------------------------------------
                                                                      2
     .296958*ii)x*z + (- .60002 - .468437*ii)y, (.61514 + .278146*ii)x  +
     ------------------------------------------------------------------------
     (.114012 + .299296*ii)x*y + (.692332 + .911618*ii)x*z + (- .61514 -
     ------------------------------------------------------------------------
     .278146*ii)y}

o3 : List

Ways to use generalEquations :

  • generalEquations(ZZ,Ideal)
  • generalEquations(ZZ,List)