设X=lim←{Xα,πβ^α,∧},λ=|∧|,如果X是λ-仿紧的且每个Xα是σ-cf-可膨胀的(σ-cf-可膨胀的),则X是σ-cf-可膨胀的(σ-cf-可膨胀的)。
Let X=lim←{Xα,πβ^α,∧},λ=|∧|. If X is 2- paraeompact and each Xα is σ-cf- expandable( σ-cf- expandable), then X is σ-cf-expandable( σ-cf-expandable).