Abstract
The non linear differential equation is considered. We investigate the number of nontrivial periodic solutions of this equation depending on k ≥ 0 for µ < 0 fixed. The results obtained can be used in a problem of time optimal control for the Van der Pol equation in order to describe the process of control.
This work was done while the second author held a C.N.R. Felloship and was visiting the University of Florence.The second author expresses her gratitude to professor R. Conti for his invitation and to the Institute of Mathematics “Ulisse Dini” for its hospitality.
This work was done while the second author held a C.N.R. Felloship and was visiting the University of Florence.The second author expresses her gratitude to professor R. Conti for his invitation and to the Institute of Mathematics “Ulisse Dini” for its hospitality.
Notes
This work was done while the second author held a C.N.R. Felloship and was visiting the University of Florence.The second author expresses her gratitude to professor R. Conti for his invitation and to the Institute of Mathematics “Ulisse Dini” for its hospitality.