作者: Neil J. A. Sloane

One of the most remarkable and beautiful theorems in coding theory is Gleason’s 1970 theorem about the weight enumerators of self-dual codes and their connections with invariant theory. In the past 3 …

We now apply the algorithm above to find the 121 orbits of norm -2 vectors from the (known) nann 0 vectors, and then apply it again to find the 665 orbits of nann -4 vectors from the vectors of nann …

The main themes. This book is mainly concerned with the problem of packing spheres in Euclidean space of dimensions 1, 2, 3, 4, 5, . . . . Given a large number of equal spheres, what is the most effi …