P
Parallel transport
Polyhedral space a simplicial complex with a metric such that each simplex with induced metric is isometric to a simplex in Euclidean space.
Principal curvature is the maximum and minimum normal curvatures at a point on a surface.
Principal direction is the direction of the principal curvatures.
Path isometry
Proper metric space is a metric space in which every closed ball is compact. Every proper metric space is complete.
Read more about this topic: Glossary Of Riemannian And Metric Geometry