2 citations · 2 across the 4 of their papers we have counts for
4 papers
Invariant measures as obstructions to attractors in dynamical systems and their role in nonholonomic mechanics
L. C. García-Naranjo, R. Ortega, A. J. Ureña
We present some rigorous results on the absence of a wide class of invariant measures for dynamical systems possessing attractors. We then consider a generalization of the classica…
On the Lambert problem with drag
Antonio J. Urena
The Lambert problem consists in connecting two given points in a given lapse of time under the gravitational influence of a fixed center. While this problem is very classical, we a…
How many Keplerian arcs are there between two points of spacetime?
Alain Albouy, Antonio J. Ureña
We consider the Keplerian arcs around a fixed Newtonian center joining two prescribed distinct positions in a prescribed flight time. We prove that, putting aside the "opposition c…
Dynamics of periodic second-order equations between an ordered pair of lower and upper solutions
Antonio J. Urena
We consider periodic second-order equations having an ordered pair of lower and upper solutions and show the existence of asymptotic trajectories heading towards the maximal and mi…