# differential -- make the derivation defined by the differential

## Synopsis

• Usage:
d=differential(L)
• Inputs:
• Outputs:
• d, an instance of the type LieDerivation, the derivation defined by the differential

## Description

If the current Lie algebra has no differential, then 0 is returned.

 i1 : L=lieAlgebra({a,b},Signs=>{1,0},Weights=>{{2,0},{2,1}}, LastWeightHomological=>true) o1 = L o1 : LieAlgebra i2 : L=differentialLieAlgebra{0_L,a} o2 = L o2 : LieAlgebra i3 : d=differential(L) o3 = d o3 : LieDerivation i4 : d b b a o4 = (3/2)(b a a) o4 : L