|  |  5.1.164 variables 
See
 leadexp;
 nvars;
 univariate;
 var;
 varstr.Syntax:variables (poly_expression)
 variables (ideal_expression)
 variables (matrix_expression)Type:ideal
Purpose:variables(p)returns the list of all ring variables the argument depends on.Example:|  |   ring r=0,(x,y,z),dp;
  variables(2);
==> _[1]=0
  variables(x+y2);
==> _[1]=x
==> _[2]=y
  variables(ideal(x+y2,x3y,z));
==> _[1]=x
==> _[2]=y
==> _[3]=z
  string(variables(ideal(x+y2,x3y,z)));
==> x,y,z
 | 
 |