\((K_3 + e, \lambda)\)-Group Divisible Designs of Type \(g^tu^1\)

Haiyan Wang1, Yanxun Chang1
1Institute of Mathematics Beijing Jiaotong University Beijing 100044, P. R. China

Abstract

Necessary and sufficient conditions are given for the existence of a \((K_3 + e, \lambda)\)-group divisible design of type \(g^tu^1\).