in this paper, we prove that every metric line in the poincare ball model of hyperbolic geometry is exactly a classical line of itself. we also proved nonexistence of periodic lines in the poincare ball model of hyperbolic geometry.

We apply the Lindstedt method to the one dimensional Fermi-Pasta-Ulam β lattice to find fully general solutions to the complete set of equations of motion. The pertubative scheme employed uses ǫ as the expansion parameter, where ǫ is the coefficient of the quartic coupling between nearest neighbors. We compare our non-secular perturbative solutions to numerical solutions and find striking agree...

This work presents an explicit formula for determining the radius of a limit cycle which is born in a Hopf bifurcation in a class of first order constant coefficient differential-delay equations. The derivation is accomplished using Lindstedt s perturbation method. 2005 Elsevier B.V. All rights reserved. PACS: 02.30.Ks; 02.30.Oz

by a gas-liquid chromatographic method. J. Lab. Clin. Med., 74:185, 1969. 22. Kang, E. S., and Gerald, P. S. : Hereditary tyrosinemia and abnormal pvrrole metabolism. J. Pediat., 77:397, 1970. 23. Gentz, J., Johansson, S., Lindblad, B., Lindstedt, S., and Zetterstr#{246}m, R. : Excretion of daminolevulinic acid in hereditary tyrosinemia. Clin. Chim. Acta, 23:257, 1969. 24. Fellman, J. H., Vanbe...

We prove the existence of oscillatory solutions of the nonlinear wave equation, under irrationality conditions stronger than the usual Diophantine one, by perturbative techniques inspired by the Lindstedt series method originally introduced in classical mechanics to study the existence of invariant tori in quasi-integrable Hamiltonian systems.

An enzyme preparation catalyzing the 2’-hydroxylation of thymidine was prepared from mycelial extracts of Neurospora crassa strain STA 4 (FGSC 2628) by chromatography on hydroxylapatite and DEAE-Sephadex A-50. The enzyme had an isoelectric point of 4.6 and a molecular weight of 47,000 (determined by gel filtration). The reaction product was identical with thymine riboside on ion exchange and th...