d=zeroDerivation(L)
The zero map from $L$ to $L$ is a derivation.
i1 : L = lieAlgebra{a,b} o1 = L o1 : LieAlgebra
i2 : dL=differential L o2 = 0 o2 : LieDerivation
i3 : d=zeroDerivation L o3 = 0 o3 : LieDerivation
i4 : dL===d o4 = true
The object zeroDerivation is a method function.