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D.2.9.5 facvar

Procedure from library redcgs.lib (see redcgs_lib).

Usage:
facvar(J);
J: an ideal in the parameters

Return:
all the free-square factors of the elements
of ideal J (non repeated). Integer factors are ignored, even 0 is ignored. It can be called from ideal @R, but the given ideal J must only contain poynomials in the parameters.

Note:
Operates in the ring @P, and the ideal J must contain only polynomials in the parameters, but can be called from ring @R.

Example:
 
LIB "redcgs.lib";
ring R=(0,a,b,c),(x,y,z),dp;
setglobalrings();
ideal J=a2-b2,a2-2ab+b2,abc-bc;
facvar(J);
==> _[1]=(a-b)
==> _[2]=(a+b)
==> _[3]=(a-1)
==> _[4]=(b)
==> _[5]=(c)


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