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D.8.3.1 parametrize

Procedure from library paramet.lib (see paramet_lib).

Usage:
parametrize(I); I ideal in an arbitrary number of variables, whose radical is prime, in a ring with global ordering

Create:
If the parametrization is successful, the basering will be changed to the parametrization ring, that is to the ring PR=0,(s,t),dp; respectively PR=0,t(1..d),dp;, depending on the dimension of the parametrized variety.

Return:
a list containing the parametrization ideal resp. the original ideal, the number of variables needed for the parametrization resp. 0, and 1 resp. 0 depending on whether the parametrization was successful or not

Example:
 
LIB "paramet.lib";
ring RING=0,(x,y,z),dp;
ideal I=z2-y2x2+x3;
parametrize(I);
==> [1]:
==>    _[1]=s2-t2
==>    _[2]=s
==>    _[3]=s2t-t3
==> [2]:
==>    2
==> [3]:
==>    1
See also: normal; parametrizepd; primdecGTZ; radical.


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            User manual for Singular version 2-0-4, May 2003, generated by texi2html.