Procedure from library central.lib (see central_lib).
Usage:
variablesStandard();
Return:
ideal, generated by algebra variables
Purpose:
computes the set of algebra variables taken in their natural order
Example:
LIB "central.lib";
ring AA = 0,(x,y,z),dp;
matrix D[3][3]=0;
D[1,2]=-z; D[1,3]=2*x; D[2,3]=-2*y;
def A = nc_algebra(1,D); setring A; // this algebra is U(sl_2)
// Variables in their natural order:
variablesStandard();
==> _[1]=x
==> _[2]=y
==> _[3]=z