The symbol - is used as notation for the negation of Lie derivations.
i1 : L = lieAlgebra{a,b}
o1 = L
o1 : LieAlgebra
|
i2 : d = lieDerivation{a a b,b b a}
o2 = d
o2 : LieDerivation
|
i3 : describe(-d)
o3 = a => (a b a)
b => - (b b a)
map => id_L
sign => 0
weight => {2, 0}
source => L
target => L
|