We denote by Λk(M, g) the vector space of g-valued differential k-forms on a manifold M over C∞(M ). For A ∈Λk(M, g), have A = AaXa with a scalar differential k-form Aa and an element a Xa in g. We define dA := dAaXa. (2.1) a Here, we assume g to be a ...