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7.2.1.1 ideal declarations (plural)

Syntax:
ideal name = list_of_poly_and_ideal_expressions ;
ideal name = ideal_expression ;

Purpose:
defines a left ideal.

Default:
0

Example:
 
ring r=0,(x,y,z),dp;
def R=nc_algebra(-1,0); // an anti-commutative algebra
setring R;
poly s1 = x2;
poly s2 = y3;
poly s3 = z;
ideal i =  s1, s2-s1, 0,s3*s2, s3^4;
i;
==> i[1]=x2
==> i[2]=y3-x2
==> i[3]=0
==> i[4]=-y3z
==> i[5]=z4
size(i);
==> 4
ncols(i);
==> 5


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