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7.5.3.0. variablesStandard
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
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See also:
variablesSorted.
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