Examples from the Web for riemann
Riemann and Beltrami are chief among those whose labors characterize the scope of this period.The Mystery of Space|Robert T. Browne
He replaces his Riemann surface by a metallic surface whose electric conductivity varies according to certain laws.
If Lobachevski's geometry is true, the parallax of a very distant star will be finite; if Riemann's is true, it will be negative.
Riemann proceeds to specialize the manifold by considerations Measure of curvature.
There is a sort of opposition between Riemann's geometry and that of Lobachevski.