摘要
LD设计是研究大集问题的重要工具.如记:LD={v∈N|具有v阶LD设计},本文证明了LD是PBD—闭集,并由此简短证明了LD设计的渐近存在性.
LD* design is an important tool for studying the theory of big sets. In this paper , it is proved that LD * is PBD-closed set and follows that LD * design of order v exists if v is larger than v0 and v = 0,l(mod(3)),where v0 is a certain number.
