Computes the kernel in the specified degree of the Lie homomorphism from [L,L] to the direct sum of [Li,Li], where Li is the Lie subalgebra generated by the ith 2-flat in the input for the holonomy Lie algebra L of an arrangement or matroid, see localLie.
i1 : L=holonomyLie({{0,1,2},{0,3,4},{1,3,5},{2,4,5}}) o1 = L o1 : LieAlgebra |
i2 : decompidealLie 3 o2 = {[5, 4, 3], [4, 5, 3]} o2 : List |