## Codes and Designs: Proceedings of a conference honoring Professor Dijen K. Ray-Chaudhuri on the occasion of his 65th birthday. The Ohio State University May 18-21, 2000Following an initiative of the late Hans Zassenhaus in 1965, the Departments of Mathematics at The Ohio State University and Denison University organize conferences in combinatorics, group theory, and ring theory. Between May 18-21, 2000, the 25th conference of this series was held. Usually, there are twenty to thirty invited 20-minute talks in each of the three main areas. However, at the 2000 meeting, the combinatorics part of the conference was extended, to honor the 65th birthday of Professor Dijen Ray-Chaudhuri. This volulme is the proceedings of this extension. Most of the papers are in coding theory and design theory, reflecting the major interest of Professor Ray-Chaudhuri, but there are articles on association schemes, algebraic graph theory, combinatorial geometry, and network flows as well. There are four surveys and seventeen research articles, and all of these went through a thorough refereeing process. The volume is primarily recommended for researchers and graduate students interested in new developments in coding theory and design theory. |

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### Contents

1 | |

9 | |

Characterization of maximal rational circulant association schemes | 37 |

Faceregular polyhedra and tilings with two combinatorial types of faces | 49 |

exceptional connections | 73 |

A singular direct product for bicolorable Steiner triple systems | 87 |

On semiregular relative difference sets in nonabelian pgroups | 99 |

Every λdesign on 6p + 1 points is type1 | 109 |

On the maximum size of a hole in an incomplete twise balanced design with specified minimum block size | 179 |

On a family of cocyclic Hadamard matrices | 187 |

A mass formula for Type II codes over finite fields of characteristic two | 207 |

A posteriori probability decoding through the discrete Fourier transform and the dual code | 215 |

Subdesigns of symmetric designs | 237 |

Linear codes over F2 + uF2 and their complete weight enumerators | 259 |

On singledeletioncorrecting codes | 273 |

Critical problems in finite vector spaces | 293 |

An introduction to balanced network flows | 125 |

On the λdesign conjecture for v 5p + 1 points | 145 |

On a class of twin balanced incomplete block designs | 157 |

Decoding some doublyeven selfdual 32 16 8 codes by hand | 165 |

Existence of Steiner systems that admit automorphisms with large cycles | 305 |

Rainbow graphs | 313 |

Backmatter | 321 |