1 citations · 1 across the 4 of their papers we have counts for
4 papers
A Remark to the Theorem of Le Calvez and Yoccoz
Christian Pries
The theorem of Le Calvez and Yoccoz states that there are no minimal homeomorphisms on the finite punctered 2-dimensional sphere S 2 . We show that this does not hold for other sur…
Quasi-Minimal, Pseudo-Minimal Systems and Dense Orbits
Christian Pries
We give a short discussion about a weaker form of minimality (called quasi-minimality). We call a system quasi-minimal if all dense orbits form an open set. It is hard to find exam…
Equicontinuous Geodesic Flows
Christian Pries
The author shows that equicontinuous geodesic flows on surfaces are periodic. A similar result for flows on 3-manifolds is also proven. The idea of the proof is to show that the re…
If all geodesics are closed on the projective plane
Christian Pries
The paper shows that the curvature of RP2 is constant iff all geodesics are closed. Therefore RP2 is the first known manifold with only one G-structure. It took quiete a long time…