Since 1994,it has been proved that Kerdock, Preparata, Goethalsand Delsartes-Goethals codes have more codewords than the linear codes withthe same length and distance.

• 1994以来已有人证明了Kerdock码；Preparata码和Delsartes? Goethals码比同样长度；同样距离的线性码有更多的码字.