RT Journal Article T1 New proof and generalizations of the Demidowitsch-Schneider criterion A1 Giraldo Suárez, Luis A1 Gascón, Francisco G. AB Analysis of the question whether or not a given dynamical system has closed trajectories is of great importance for applications and represents independent theoretical interest. The authors give a new geometrical proof of the extension of the Bendixson-Dulac criterion on the absence of closed trajectories in R3 obtained by V. B. Demidovich [Z. Angew. Math. Mech. 46, 145-146 (1966; Zbl 0138.33303)] and corrected later by K. R. Schneider [Z. Angew. Math. Mech. 49, 441-443 (1969; Zbl 0186.15603)]. Due to the flexibility of the new approach, extensions of the Demidovich criterion to several directions have been obtained. Illustrative examples are considered and someopen problems are discussed. PB American Institute of Physics SN 1089-7658 YR 2000 FD 2000 LK https://hdl.handle.net/20.500.14352/57586 UL https://hdl.handle.net/20.500.14352/57586 LA eng NO D.G.E.S. DS Docta Complutense RD 3 may 2024