证明了一个压缩体X的正边界上的一个无交简单闭曲线组ζ是素的当且仅当沿着ζ的任何子集往X上加2-环柄所得的3-流形仍是一个压缩体。该结果是Gordon的一个定理的推广。
It is shown that a collection ζ of disjoint simple loops in the positive boundary of a compression body X is primitive if and only if the 3 - manifold obtained by adding 2 - handles to X along any subset of ζ is still a compression body.