JACKET MATRICES Jacket matrix order 4 and Mersenne matrix order 3 Jacket matrix [1] is a square matrix A of order n, defined by inversed matrix B=A^{–1} which entries are proportional to inversed entries of transposed matrix: nB_{ij}=1/A^{T}_{ij}, AB=BA=I. Jacket matrices includes symmetric Hadamard matrices.
WIKI [1]  [2]  [3] 
