 a symmetric 
% Kruskal tensor decomposition of a tensor $\mathcal{A}$ has the following form:
%
% $$\mathcal{A} = \sum_{i=1}^{r} x_{i}^{m}$$
%
% In this notation, a subscript refers to a column index. A superscript
% refers to  the outer product of a single vector with itself $m$ times.
%
% $$x^{m} = \underbrace{x \circ x \circ ... \circ x}_{\mbox{m-times}}.$$
%
% The number of summands in the decomposition, $r$, is referred to as the 
% number of components of the symmetric Kruskal tensor. 
%
% An alterna