  | ### 4.6.1 ideal declarations Syntax: `ideal` name `=` list_of_poly_and_ideal_expressions `;` `ideal` name `=` ideal_expression `;` Purpose: defines an ideal. Default: 0 Example:
        ring r=0,(x,y,z),dp;
        poly s1 = x2;
        poly s2 = y3;
        poly s3 = z;
        ideal i =  s1, s2-s1, 0,s2*s3, 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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