Images of some of the new Plotkin type Arrays |
An OD(56;7,7,7,7,7,7,7,7) is a square matrix with 56 mutually orthogonal rows. The entries are from the set {a,-a, b, -b, c, -c, d, -d, e, -e, f, -f, g, -g, h, -h} and each of the 8 variables occurs 7 times per row. Similarly for the other OD's. In the images, the eight variables a,b,c,d,e,f,g,h are represented by different colors (see the key at the bottom of the image). The minus signs indicate where a variable is to be negated.
Last update: 2003 July 12