Learning an hypercube
Warm up: Revisiting [NgRe06] Proof
The minima of 4th order momentum momP(V),4 , of an hypercubes P(V) (V orthogonal), over the unit sphere Sn are located at ±v1 ... ±vn , the row vectors of ± V
Proof
Almost there. By orthogonality of V one get singularity.
Calculate 2nd order derivative to obtain minimality.