在这个时候，拓扑学被称做位置几何学。
At this time the subject of topology was known as analysis situs .
学习拓扑学的学生将理解这一情况。在这个时候，拓扑学被称做位置几何学。
Students of topology will recognize this situation . At this time the subject of topology was known as analysis situs .
位置几何学