卡普兰斯基稠密性定理
kaplansky density theorem
稠密线性变换环
dense ring of linear transformations
稠密线性序集
dense linearly ordered set
S-稠密集
S-set of the first programme
S-无处稠密集
S-set of Second programme
σ闭离散的稠密子集
closed-discrete dense subset
稠密大气层
condensed atmospheric layer