本文采用格论方法研究拓扑学中连续映射的扩充问题，给出陪域为T＿3空间时连续映射扩充的充要条件。
By lattice-theoretic methods we give a necessary and sufficient condition for a continuous mapping with the codomain T_3 to be extended continuously from a dense subspace to the whole space .
陪域