Singular

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