tive, often equivalent expression for a symmetric Kruskal tensor 
% decomposition specifies a real-valued weight for each of the summands
% in the outer product. The $r$-vector formed by these weights is referred 
% to as the weight or lambda vector of the symmetric Kruskal decomposition.
%
% $$\mathcal{A} = \sum_{i=1}^{r} \lambda_{i} \; x_{i}^{m}$$
%
% In certain cases the lambda vector is required in order for a symmetric
% Kruskal decomposition to exist, e.g. when a symmetric Kruskal tensor has 
% an eve